JIS G4305 SUS312L Steel Plate | 312L Stainless Steel
What is JIS G4305 SUS312L Steel Plate?
As a stainless steel supplier and China mill-direct exporter, SHH STEEL supplies JIS G4305 SUS312L Steel Plate, also known as 312L stainless steel. SUS312L is a 6 % molybdenum super-austenitic grade of JIS G4305:2021, the Japanese Industrial Standard for cold-rolled stainless steel plate, sheet and strip. It contains 19.00 – 21.00 % chromium, 17.50 – 19.50 % nickel, 6.00 – 7.00 % molybdenum, 0.50 – 1.00 % copper and 0.16 – 0.25 % nitrogen, with carbon limited to 0.020 %.
GB/T 20878 cross-references SUS312L to UNS S31254, EN 1.4547 and the Chinese grade GB/T 4237 015Cr20Ni18Mo6CuN S31252 plate. In Europe it is supplied as EN 10088-2 1.4547 plate. S31254 is widely known by the trade name 254 SMO, a trademark of Outokumpu; SHH STEEL supplies the standard grade, not the branded product, unless the customer names a specific mill.
This page summarises the requirements of JIS G4305:2021 for SUS312L: chemical composition, mechanical properties, surface finishes, standard sizes and the informative heat-treatment conditions of Annex JA. Hot-rolled plate of the same grade is ordered to JIS G 4304:2021, which also lists SUS312L. SHH STEEL quotes either standard and confirms the edition named on the drawing before an order is placed.
SUS312L material specification and SHH STEEL supply scope
| Item | JIS G4305:2021 requirement | SHH STEEL supply |
|---|---|---|
| Standard | JIS G 4305:2021, cold-rolled stainless steel plate, sheet and strip | Full compliance; JIS G 4304:2021 for hot-rolled plate |
| Grade | SUS312L (austenitic) | Confirmed by heat analysis on the certificate |
| Standard plate sizes (Table 16) | Thickness 0.30 – 20.0 mm; 1 000 × 2 000, 1 219 × 2 438, 1 219 × 3 048 and 1 524 × 3 048 mm | Other sizes by agreement, as Table 16 allows |
| Standard strip thickness (Table 17) | 0.30 – 6.0 mm | Coil and slit strip |
| Surface finish (Table 15) | No.2D, No.2B, BA, HL; polished finishes by the manufacturer’s method | Finish written into the mill order |
| Inspection document | JIS G 0415, inspection certificate 3.1, unless otherwise specified | 3.1 standard; 3.2 with third-party witness on request |
Mechanical properties in JIS G4305 apply to thickness 0.30 mm and above, and the standard notes that properties after heat treatment carried out by the user are not specified. Clause 7 makes intergranular corrosion testing a matter for agreement.
Chemical composition of JIS G4305 SUS312L (heat analysis, %)
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.020 |
| Silicon (Si) | ≤ 0.80 |
| Manganese (Mn) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.030 |
| Sulphur (S) | ≤ 0.015 |
| Nickel (Ni) | 17.50 – 19.50 |
| Chromium (Cr) | 19.00 – 21.00 |
| Molybdenum (Mo) | 6.00 – 7.00 |
| Copper (Cu) | 0.50 – 1.00 |
| Nitrogen (N) | 0.16 – 0.25 |
Phosphorus (0.030 %) and sulphur (0.015 %) limits are tighter than for the 300-series grades. Using PREN = %Cr + 3.3 × %Mo + 16 × %N, the minimum limits give about 41.4.
Mechanical properties of SUS312L in the solution-treated condition (JIS G4305 Table 8)
| Property | Requirement |
|---|---|
| 0.2 % proof stress | ≥ 300 N/mm² |
| Tensile strength | ≥ 650 N/mm² |
| Elongation | ≥ 35 % |
| Hardness | ≤ 223 HBW, or ≤ 96 HRBW/HRBS, or ≤ 230 HV |
The nitrogen addition gives SUS312L a minimum proof stress well above the 175 N/mm² of SUS316L and the 215 N/mm² of SUS890L in the same table.
Surface finishes for SUS312L sheet and plate
| Finish (Table 15) | Description |
|---|---|
| No.2D | Cold rolled, heat treated and pickled (or equivalent); may include a final light pass on dull rolls |
| No.2B | Cold rolled, heat treated, pickled, then lightly cold rolled for a suitable lustre |
| BA | Bright annealed after cold rolling |
| HL | Polished with abrasive of suitable grit to give continuous polishing lines |
JIS G4305 leaves polished finishes such as No.3, No.4, #240, #320 and #400 to the manufacturer’s method, so SHH STEEL writes the finish, the grit and any protective film into the purchase order. For austenitic grades, No.2B is the usual finish for cold-rolled sheet and BA is used where a bright surface is needed.
Heat treatment and delivery condition of SUS312L
| Treatment | Condition (Annex JA, Table JA.1) |
|---|---|
| Solution treatment | 1 010 – 1 150 °C, rapid cooling |
Annex JA is informative. For high-molybdenum grades, quick cooling through the intermediate temperature range matters, because slow cooling can allow secondary phases that reduce corrosion resistance.
Table 19 of JIS G4305 gives a basic mass of 8.03 kg/(mm·m²) for SUS312L, which is used to calculate plate weight (equivalent to a density of 8.03 g/cm³). Lead time from the mill is normally 30 – 40 days after order confirmation, depending on size, finish and rolling schedule.
Key characteristics of 312L stainless steel
- About 6 – 7 % molybdenum with 0.16 – 0.25 % nitrogen for resistance to pitting and crevice corrosion.
- PREN about 41 at the minimum limits (Cr + 3.3 Mo + 16 N).
- Proof stress ≥ 300 N/mm², tensile strength ≥ 650 N/mm².
- Very low carbon (≤ 0.020 %) for welded fabrication.
- Density 8.03 g/cm³ (JIS G4305 Table 19).
SUS312L equivalent grades
| System | Grade | Comment |
|---|---|---|
| ASTM / UNS | UNS S31254 (ASTM A240) | Close; A240: Cr 19.5 – 20.5 %, Ni 17.5 – 18.5 %, Mo 6.0 – 6.5 %, N 0.18 – 0.25 %, S ≤ 0.010 % |
| EN 10088-2 | EN 10088-2 1.4547 (X1CrNiMoCuN20-18-7) | Cross-referenced in GB/T 20878 Table C.1 |
| China | GB/T 4237 S31252 (015Cr20Ni18Mo6CuN) | Cross-referenced to S31254 and SUS312L |
The ASTM A240 ranges for S31254 are narrower than the JIS ranges, so a dual-certified heat must meet the tighter A240 limits, in particular molybdenum 6.00 – 6.50 % and sulphur 0.010 % maximum. For pressure equipment in Europe, see EN 10028-7 1.4547 pressure vessel plate.
Applications of JIS G4305 SUS312L Steel Plate
The Japan Stainless Steel Association lists the main uses of SUS312L as:
- Seawater heat exchangers
- Various process plants
- Flue gas ducts
- Offshore structures
- Food tanks
For lower-chloride service, JIS G4305 SUS317L steel plate or ASTM A240 Type 904L sheet and plate may be compared; SHH STEEL can supply the comparison of limits.
SUS312L compared with related JIS G4305 grades
The table compares SUS312L with the JIS G4305:2021 grades that buyers most often consider alongside it. Chemistry is taken from Tables 3 – 7 and the minimum mechanical properties from Tables 8 – 14 of the standard, all in the condition in which the grade is normally supplied.
| JIS G4305 grade | Cr % | Ni % | Mo % | Other | 0.2 % proof stress, N/mm² | Tensile, N/mm² | Elongation, % |
|---|---|---|---|---|---|---|---|
| JIS G4305 SUS316L | 16.00 – 18.00 | 12.00 – 15.00 | 2.00 – 3.00 | C ≤ 0.030 | 175 | 480 | 40 |
| JIS G4305 SUS317L | 18.00 – 20.00 | 11.00 – 15.00 | 3.00 – 4.00 | C ≤ 0.030 | 175 | 480 | 40 |
| JIS G4305 SUS890L | 19.00 – 23.00 | 23.00 – 28.00 | 4.00 – 5.00 | Cu 1.00 – 2.00 | 215 | 490 | 35 |
| SUS312L | 19.00 – 21.00 | 17.50 – 19.50 | 6.00 – 7.00 | Cu 0.50 – 1.00, N 0.16 – 0.25 | 300 | 650 | 35 |
| JIS G4305 SUS836L | 19.00 – 24.00 | 24.00 – 26.00 | 5.00 – 7.00 | N ≤ 0.25 | 275 | 640 | 40 |
SUS312L and SUS836L are the two 6 % molybdenum class grades of JIS G4305. SUS312L has less nickel and more chromium than SUS836L and a higher minimum proof stress. SHH STEEL can quote the grades in this table side by side when a buyer is still choosing between them.
SUS312L to JIS G4305 (cold rolled) or JIS G4304 (hot rolled)?
SUS312L is listed in both JIS G4305:2021 (cold-rolled plate, sheet and strip) and JIS G4304:2021 (hot-rolled plate, sheet and strip). The chemistry and the mechanical property tables are the same in both standards, but the product range, finish and tolerances differ:
| Item | JIS G4305 (cold rolled) | JIS G4304 (hot rolled) |
|---|---|---|
| Standard plate thicknesses (Table 16) | 0.30 – 20.0 mm | 2.0 – 35.0 mm |
| Standard plate sizes | 1 000 × 2 000, 1 219 × 2 438, 1 219 × 3 048, 1 524 × 3 048 mm | Same four sizes |
| Standard strip thicknesses (Table 17) | 0.30 – 6.0 mm | 2.0 – 9.0 mm |
| Surface finish (Table 15) | No.2D, No.2B, BA, HL | No.1 (hot rolled, heat treated and pickled) |
| Plate thickness tolerance | Table 20, or ET / ST on request | Classes A, B or C (Tables 20 – 22); B and C use an addition to thickness for calculated mass |
As a rule, thin sheet and anything that needs a bright or brushed surface is ordered to JIS G4305, while heavier plate for fabrication is ordered to JIS G4304. Sizes outside the tables are possible by agreement in both standards. SHH STEEL confirms which standard and finish suit the part before quoting.
Corrosion resistance of SUS312L
A common way to rank resistance to pitting is the pitting resistance equivalent number, PREN = %Cr + 3.3 × %Mo + 16 × %N. Calculated from the JIS G4305 limits, SUS312L has a PREN of about 41.4 at the minimum of every range and about 48.1 at the maximum. PREN is a ranking tool, not a guarantee of performance in a given environment, and actual heats normally sit between these values; the certificate analysis gives the real figure for each heat. SHH STEEL can calculate the PREN of the heat offered from its certificate before the order is confirmed.
With 6.00 – 7.00 % molybdenum and 0.16 – 0.25 % nitrogen, SUS312L belongs to the super-austenitic class used for seawater and other high-chloride service. JSSA lists seawater heat exchangers, flue gas ducts and offshore structures as its main uses, all environments where 316L would suffer pitting or crevice corrosion.
Where resistance to intergranular corrosion must be demonstrated, clause 7 of JIS G4305 lets the purchaser specify one of four test methods: JIS G 0571 (oxalic acid etch test), JIS G 0572 (ferric sulphate – sulphuric acid test), JIS G 0573 (65 % nitric acid test) or JIS G 0575 (copper sulphate – sulphuric acid test). One test piece is taken per heat and heat-treatment lot. SHH STEEL writes the chosen method and acceptance criterion into the mill order when a project requires it.
Physical properties of SUS312L
| Property | Typical value (Euro Inox, Tables of Technical Properties, EN 1.4547) |
|---|---|
| Density | 8.0 g/cm³ |
| Modulus of elasticity at 20 °C | 195 GPa |
| Mean thermal expansion 20 – 200 °C | 17.0 × 10⁻⁶ /K |
| Mean thermal expansion 20 – 400 °C | 18.0 × 10⁻⁶ /K |
| Thermal conductivity at 20 °C | 14 W/(m·K) |
| Specific heat at 20 °C | 500 J/(kg·K) |
| Electrical resistivity at 20 °C | 0.85 Ω·mm²/m |
JIS G4305 gives physical data only as the basic mass of 8.03 kg/(mm·m²) in Table 19. The other values are typical figures published for EN 1.4547 (Euro Inox) and are given for design guidance only; they are not acceptance requirements for SUS312L. On request, SHH STEEL can pass on the producing mill’s own data sheet for the heat supplied.
Welding, forming and machining SUS312L
SUS312L is an austenitic steel and is welded readily by TIG, MIG, plasma and manual metal arc processes. Low carbon limits chromium carbide precipitation in the heat-affected zone, so welded parts normally keep their resistance to intergranular corrosion without post-weld heat treatment. Austenitic steels have a higher thermal expansion and lower thermal conductivity than carbon steel, so distortion control (tacking sequence, fixtures, balanced welding) matters more.
High-molybdenum austenitic steels show molybdenum segregation in weld metal, so they are normally welded with over-alloyed nickel-base filler metals rather than matching filler; the welding procedure and filler should be qualified for the service. Heat input should be controlled and the weld cleaned and pickled afterwards. In forming and machining, SUS312L behaves like other austenitic grades but with higher strength, so forming forces are higher and tooling must be rigid.
SHH STEEL can deliver SUS312L cut to size, bevelled or pre-formed through its processing partners, so that the fabricator receives parts ready for welding.
Dimensional tolerances for SUS312L plate and sheet (JIS G4305)
JIS G4305:2021 clause 9 sets the tolerances for cold-rolled plate, sheet and strip, and SHH STEEL checks thickness at the positions the standard defines before shipment. Thickness tolerances for plate are given in Table 20 and depend on thickness and width:
| Thickness (mm) | Width < 1 250 mm | Width 1 250 – 1 600 mm |
|---|---|---|
| 0.30 – < 0.60 | ± 0.05 | ± 0.08 |
| 0.60 – < 0.80 | ± 0.07 | ± 0.09 |
| 0.80 – < 1.00 | ± 0.09 | ± 0.10 |
| 1.00 – < 1.25 | ± 0.10 | ± 0.12 |
| 1.25 – < 1.60 | ± 0.12 | ± 0.15 |
| 1.60 – < 2.00 | ± 0.15 | ± 0.17 |
| 2.00 – < 2.50 | ± 0.17 | ± 0.20 |
| 2.50 – < 3.15 | ± 0.22 | ± 0.25 |
| 3.15 – < 4.00 | ± 0.25 | ± 0.30 |
| 4.00 – < 5.00 | ± 0.35 | ± 0.40 |
| 5.00 – < 6.00 | ± 0.40 | ± 0.45 |
| 6.00 – < 8.00 | ± 0.50 | ± 0.50 |
| 8.00 – < 10.0 | ± 0.60 | ± 0.60 |
| 10.0 – < 16.0 | ± 0.70 | ± 0.70 |
| 16.0 – 25.0 | ± 0.80 | ± 0.80 |
Tighter thickness tolerances can be ordered with the symbols ET (Table 22) or ST (Table 23), and narrower width tolerances with EW (Table 26). Plate width tolerance (Table 24) is +10 / 0 mm for lengths up to 3 500 mm, and plate length tolerance (Table 27) is +10 / 0 mm for thickness under 10 mm and lengths up to 3 500 mm. Flatness is measured on request: Table 28 allows 15 – 20 mm per 3 500 mm length, or 3 – 6 mm when the special flatness symbol EF is ordered.
For hot-rolled SUS312L plate ordered to JIS G 4304, the tolerances of that standard apply. SHH STEEL states the tolerance symbols on the quotation so that the buyer knows exactly which table the plate will be measured against.
Testing, inspection and marking of SUS312L
Clause 11 of JIS G4305 sets the test rules. Chemical analysis follows JIS G 0404 and JIS G 0320, and a product (check) analysis to JIS G 0321 can be requested by the purchaser. For mechanical tests, one sample is taken from plate or strip of the same heat and the same heat-treatment condition, and one test piece is used for each test.
- Tensile test to JIS Z 2241 at 23 ± 5 °C, using test piece No. 4, No. 10 or No. 13B (No. 14A, 14B or 5 also allowed).
- Hardness test to JIS Z 2243-1 (Brinell), JIS Z 2244-1 (Vickers) or JIS Z 2245 (Rockwell), at 23 ± 5 °C.
- Bend test to JIS Z 2248 where the grade has a bend requirement; the manufacturer may omit it, but the material must still meet it, and it must be done if the purchaser asks.
- Inspection of chemistry, mechanical properties, surface finish, dimensions and appearance under clause 12; corrosion resistance only when specified.
Under clause 13 each plate or bundle is marked with the grade symbol, dimensions, any special tolerance or flatness symbols (ET, ST, EW, EF), the surface finish, the heat-treatment symbol where applicable, the manufacturer’s name or mark, and the heat or inspection number. Clause 14 makes the inspection document JIS G 0415 type 3.1 unless another type is ordered; SHH STEEL checks the marking against the certificate before shipment, and a third-party inspector arranged by SHH STEEL can witness the tests when a 3.2 document is required.
How to order SUS312L plate and sheet
A complete enquiry avoids delays and wrong deliveries. For SUS312L we recommend stating:
- Standard and edition: JIS G 4305:2021 (cold rolled) or JIS G 4304:2021 (hot rolled), grade SUS312L.
- Product form: plate, sheet, coil or strip; thickness, width and length, or coil inner diameter and weight.
- Tolerance and flatness symbols if tighter than standard (ET, ST, EW, EF).
- Surface finish from Table 15 (No.2D, No.2B, BA, HL) or a polished finish with grit and protective film.
- Heat-treatment condition, and any intergranular corrosion test method (JIS G 0571 – 0575).
- Inspection document type (JIS G 0415 3.1 by default, 3.2 if third-party witness is needed).
- Any dual certification required, for example to ASTM A240 or EN 10088-2, and any product analysis or PMI.
- Packing, marking and destination port; SHH STEEL can add customer marking or bar codes on request.
SHH STEEL reviews every enquiry against these points and confirms in writing anything that the mill cannot meet before the order is placed.
How to calculate the weight of SUS312L plate
Table 18 of JIS G4305 calculates plate mass from the basic mass in Table 19, which for SUS312L is 8.03 kg per mm of thickness per m² of area. The basic mass is multiplied by the thickness in millimetres to give the unit mass in kg/m², then by the plate area in m², and the result is rounded as the table specifies.
| Example | Calculation | Mass |
|---|---|---|
| SUS312L, 3.0 × 1 219 × 2 438 mm | 8.03 × 3.0 × (1.219 × 2.438) | about 71.6 kg per sheet |
Invoiced weight may be calculated (theoretical) or actual (weighed), and this should be agreed at the order. SHH STEEL states which method is used on the quotation, and the SHH STEEL packing list shows both the calculated and the actual weight of each bundle.
Why choose SHH STEEL for SUS312L
As a SUS312L supplier, we find that buyers usually worry less about price than about getting the right material on time. The table below lists the concerns we hear most often and how SHH STEEL deals with each one.
| Buyer concern | Risk | How SHH STEEL handles it |
|---|---|---|
| Low molybdenum | Molybdenum near 6.0 % gives less margin than expected. | Molybdenum and nitrogen are checked on the certificate and by analysis. |
| Wrong alloy | A lower-alloyed 904L-type grade is offered as equivalent. | Grade, UNS number and full chemistry are written into the order and checked by PMI. |
| Weld procedure | Filler metal with too little molybdenum is used. | SHH STEEL reminds the fabricator that the welding procedure and filler must be qualified for 6 % Mo steel. |
| Minimum order | Mills set high minimums for less common grades. | Orders are consolidated so smaller lots can join a mill rolling where the mill makes the grade. |
| Delivery tracking | Delays at rolling, annealing or testing are found too late. | A dedicated person follows the schedule and reports progress at each stage. |
SHH STEEL also offers steel cutting services, bending and forming services, a third-party testing service with partner laboratories, and a worldwide shipping service. See our full range of stainless steel sheets and plates.
FAQ
- What is SUS312L equivalent to?
- GB/T 20878 Table C.1 lists SUS312L against UNS S31254, EN 1.4547 (X1CrNiMoCuN20-18-7) and the Chinese grade 015Cr20Ni18Mo6CuN, ISC S31252. The grades are close, but ASTM A240 S31254 has narrower limits: chromium 19.5 – 20.5 %, nickel 17.5 – 18.5 %, molybdenum 6.0 – 6.5 % and sulphur 0.010 % maximum. A heat certified to both must meet the tighter values. S31254 is often called 254 SMO, which is an Outokumpu trademark, so purchase orders should name the standard and UNS number. SHH STEEL checks the overlap for each order. Every SUS312L plate shipped by SHH STEEL carries an inspection document to JIS G 0415, type 3.1 by default. Purchase orders should name JIS G4305, its edition, the grade, the thickness and the inspection document required, so the certificate can be checked against the same tables.
- What is the chemical composition of JIS G4305 SUS312L?
- JIS G4305:2021 sets the following heat-analysis limits for SUS312L: Carbon (C) ≤ 0.020; Silicon (Si) ≤ 0.80; Manganese (Mn) ≤ 1.00; Phosphorus (P) ≤ 0.030; Sulphur (S) ≤ 0.015; Nickel (Ni) 17.50 – 19.50; Chromium (Cr) 19.00 – 21.00; Molybdenum (Mo) 6.00 – 7.00; Copper (Cu) 0.50 – 1.00; Nitrogen (N) 0.16 – 0.25. The high molybdenum and nitrogen levels place SUS312L in the 6 % molybdenum super-austenitic class. Elements not listed are not added intentionally; where the standard asks for the content of optional elements to be reported, it appears on the inspection certificate. SHH STEEL checks every certificate against these limits before shipment and can arrange an independent check analysis by a partner laboratory. Where a project specification adds requirements beyond JIS G4305, they should be written into the enquiry so the mill can confirm them before rolling.
- What are the mechanical properties of SUS312L plate?
- In the solution-treated condition, JIS G4305 Table 8 requires SUS312L to have a 0.2 % proof stress of at least 300 N/mm², a tensile strength of at least 650 N/mm² and an elongation of at least 35 %. Hardness must not exceed 223 HBW, 96 HRBW or 230 HV; only one hardness method is needed, chosen by the manufacturer unless the order specifies it. These values apply to thickness 0.30 mm and above, and proof stress applies when the purchaser asks for it. The nitrogen gives a higher proof stress than SUS316L (175 N/mm²) or SUS890L (215 N/mm²). SHH STEEL checks the tensile and hardness results on the 3.1 inspection certificate for every heat before the material is released. Any supplementary test, such as a product analysis or a corrosion test, has to be agreed at the enquiry stage because it cannot be added after delivery.
- How is SUS312L heat treated?
- Annex JA of JIS G4305 gives solution treatment at 1 010 – 1 150 °C with rapid cooling as the example heat treatment for SUS312L. The annex is informative, so it shows typical conditions rather than mandatory limits, and the mill applies its own qualified practice within the requirements of the standard. For high-molybdenum austenitic steel, rapid cooling matters because slow cooling can form secondary phases that lower corrosion resistance. SHH STEEL supplies SUS312L in the heat-treated condition stated on the order and asks the mill to record the treatment on the inspection certificate, so the fabricator knows the starting condition of the material. If a drawing names more than one standard, the material must meet each of them, and the certificate should state every standard it claims.
- What sizes and finishes of SUS312L can SHH STEEL supply?
- JIS G4305 lists standard plate thicknesses from 0.30 mm to 20.0 mm and sheet sizes from 1 000 × 2 000 mm to 1 524 × 3 048 mm; strip is listed from 0.30 mm to 6.0 mm. The standard finishes are No.2D, No.2B, BA and HL, with polished finishes made by the manufacturer's method. Other sizes are possible by agreement, and hot-rolled plate is ordered to JIS G 4304. SHH STEEL confirms with the mill which sizes it can roll in SUS312L, then offers cut-to-size blanks, slit coil or full plates. Lead time is normally 30 – 40 days. The figures quoted are the limits of JIS G4305; the actual values for a given heat are those reported on the mill test certificate.
- Where is SUS312L used?
- The Japan Stainless Steel Association lists seawater heat exchangers, various process plants, flue gas ducts, offshore structures and food tanks as the main uses of SUS312L. All of these involve chlorides or acidic condensates where the 6.00 – 7.00 % molybdenum and 0.16 – 0.25 % nitrogen give much more resistance to pitting and crevice corrosion than the 316L family. Its 300 N/mm² minimum proof stress also helps designers reduce thickness. SHH STEEL supplies SUS312L plate and sheet with full JIS G4305 compliance, and can arrange corrosion testing through partner laboratories when a project specification calls for it. Purchase orders should name JIS G4305, its edition, the grade, the thickness and the inspection document required, so the certificate can be checked against the same tables.
Conclusion
JIS G4305 SUS312L Steel Plate (312L stainless steel) is the 6 % molybdenum, nitrogen-alloyed super-austenitic grade of JIS G4305, used for seawater heat exchangers, flue gas ducts and other chloride service. SHH STEEL supplies it with full JIS G4305 compliance, 3.1 inspection certificates and optional third-party testing, with a normal lead time of 30 – 40 days. Contact SHH STEEL for availability, sizes and a quotation for your SUS312L requirement.
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