JIS G4305 SUS447J1 Steel Plate | 447J1 Stainless Steel
What is JIS G4305 SUS447J1 Steel Plate?
As a stainless steel supplier and China mill-direct exporter, SHH STEEL supplies JIS G4305 SUS447J1 Steel Plate, also known as 447J1 stainless steel. SUS447J1 is a super-ferritic grade of JIS G4305:2021, the Japanese Industrial Standard for cold-rolled stainless steel plate, sheet and strip. It contains 28.50 – 32.00 % chromium and 1.50 – 2.50 % molybdenum, with very low carbon (0.010 %) and nitrogen (0.015 %).
JSSA describes SUS447J1 as having very high weather resistance comparable to titanium, with a pitting index (Cr + 3.3 Mo) of about 36.5. GB/T 20878 cross-references it to the Chinese grade GB/T 4237 008Cr30Mo2 S13091 plate and to ISO X1CrMo30-2, with EN 1.4135 shown in brackets.
This page summarises the requirements of JIS G4305:2021 for SUS447J1: 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 SUS447J1. SHH STEEL quotes either standard and confirms the edition named on the drawing before an order is placed.
SUS447J1 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 | SUS447J1 (ferritic) | 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 SUS447J1 (heat analysis, %)
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.010 |
| Silicon (Si) | ≤ 0.40 |
| Manganese (Mn) | ≤ 0.40 |
| Phosphorus (P) | ≤ 0.030 |
| Sulphur (S) | ≤ 0.020 |
| Chromium (Cr) | 28.50 – 32.00 |
| Molybdenum (Mo) | 1.50 – 2.50 |
| Nitrogen (N) | ≤ 0.015 |
| Nickel, copper | Ni ≤ 0.50, Cu ≤ 0.20, Ni + Cu ≤ 0.50 |
Carbon and nitrogen are kept very low, which is what makes such a high-chromium ferritic steel usable. Using Cr + 3.3 × Mo, the minimum limits give about 33.5.
Mechanical properties of SUS447J1 in the annealed condition (JIS G4305 Table 11)
| Property | Requirement |
|---|---|
| 0.2 % proof stress | ≥ 295 N/mm² |
| Tensile strength | ≥ 450 N/mm² |
| Elongation | ≥ 22 % |
| Hardness | ≤ 207 HBW |
The proof stress is higher than the 245 N/mm² of JIS G4305 SUS445J1 and the 175 N/mm² of JIS G4305 SUS430LX.
Surface finishes for SUS447J1 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 ferritic sheet, No.2B, BA and HL are common; BA and HL are used for appliance and building surfaces.
Heat treatment and delivery condition of SUS447J1
| Treatment | Condition (Annex JA, Table JA.3) |
|---|---|
| Annealing | 900 – 1 050 °C, rapid cooling |
Annex JA is informative. Ferritic grades are annealed rather than solution treated, and they do not harden on quenching, so either rapid or slow cooling is allowed where the annex says so.
Table 19 of JIS G4305 gives a basic mass of 7.64 kg/(mm·m²) for SUS447J1, which is used to calculate plate weight (equivalent to a density of 7.64 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 447J1 stainless steel
- Chromium 28.5 – 32 % with 1.5 – 2.5 % molybdenum.
- Very low carbon (≤ 0.010 %) and nitrogen (≤ 0.015 %).
- JSSA: weather resistance comparable to titanium.
- Proof stress ≥ 295 N/mm², tensile strength ≥ 450 N/mm².
- Magnetic in all conditions.
- Density 7.64 g/cm³ (JIS G4305 Table 19), lower than the 7.70 g/cm³ of SUS430LX.
SUS447J1 equivalent grades
| System | Grade | Comment |
|---|---|---|
| China | GB/T 4237 S13091 (008Cr30Mo2) | Cross-referenced in GB/T 20878 Table C.1 |
| ISO | X1CrMo30-2 | Listed in GB/T 20878 Table C.1 |
| EN | (1.4135), shown in brackets | Related number; not an EN 10088-2 grade |
| ASTM | No listed equivalent; EN 10088-2 1.4592 plate is a different 29Cr-4Mo grade | Not equivalent |
Within JIS G4305, JIS G4305 SUS444 steel plate is the lower-alloy molybdenum ferritic grade.
Applications of JIS G4305 SUS447J1 Steel Plate
The Japan Stainless Steel Association lists the main uses of SUS447J1 as:
- Waterfront roofing and exterior cladding
- Organic acid plants
- Caustic soda plants
SUS447J1 is a specialised grade. SHH STEEL confirms mill availability and minimum quantities before quoting.
SUS447J1 compared with related JIS G4305 grades
The table compares SUS447J1 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 SUS430LX | 16.00 – 19.00 | – | – | Ti or Nb 0.10 – 1.00 | 175 | 360 | 22 |
| JIS G4305 SUS436L | 16.00 – 19.00 | – | 0.75 – 1.50 | Ti, Nb, Zr | 245 | 410 | 20 |
| JIS G4305 SUS443J1 | 20.00 – 23.00 | – | – | Cu 0.30 – 0.80; Ti, Nb, Zr | 205 | 390 | 22 |
| JIS G4305 SUS444 | 17.00 – 20.00 | – | 1.75 – 2.50 | Ti, Nb, Zr | 245 | 410 | 20 |
| JIS G4305 SUS445J1 | 21.00 – 24.00 | – | 0.70 – 1.50 | N ≤ 0.025 | 245 | 410 | 20 |
| SUS447J1 | 28.50 – 32.00 | – | 1.50 – 2.50 | C ≤ 0.010, N ≤ 0.015 | 295 | 450 | 22 |
SUS447J1 has by far the highest chromium of the ferritic grades in JIS G4305. JSSA gives it a pitting index of about 36.5, in the range of the duplex grade JIS G4305 SUS329J4L (32.0 – 35.0) and above, without any nickel. SHH STEEL can quote the grades in this table side by side when a buyer is still choosing between them.
SUS447J1 to JIS G4305 (cold rolled) or JIS G4304 (hot rolled)?
SUS447J1 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 SUS447J1
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, SUS447J1 has a PREN of about 33.5 at the minimum of every range and about 40.5 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.
JSSA describes SUS447J1 as having extremely good weather resistance comparable with titanium, with a pitting index of about 36.5, and lists organic acid and caustic soda plants among its uses. Its very low carbon (0.010 %) and nitrogen (0.015 %) are essential for toughness and intergranular corrosion resistance in such a high-chromium steel.
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.
Welding, forming and machining SUS447J1
SUS447J1 is a ferritic steel. Ferritic grades are welded with lower heat input than austenitic grades, because grain growth in the heat-affected zone can reduce toughness and ductility; stabilised and low-interstitial grades are designed to limit this effect. Thin sheet is commonly joined by TIG, plasma, resistance or laser welding. Ferritic steels have lower thermal expansion than austenitic steels, so they distort less during welding and in thermal cycling.
In forming, ferritic sheet has lower work hardening than austenitic sheet and is often chosen for deep-drawn appliance parts; its bend requirement in JIS G4305 Table 11 is checked by the mill. High-chromium ferritic steels can lose toughness if held at intermediate temperatures, which is why Annex JA calls for rapid cooling after annealing at 900 – 1 050 °C.
SHH STEEL can deliver SUS447J1 cut to size, bevelled or pre-formed through its processing partners, so that the fabricator receives parts ready for welding.
- Weld with low heat input and good gas shielding to avoid pick-up of carbon and nitrogen.
- Use filler metal approved for super-ferritic steel.
- Confirm toughness requirements with the mill for thicker sections.
Dimensional tolerances for SUS447J1 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 SUS447J1 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 SUS447J1
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 SUS447J1 plate and sheet
A complete enquiry avoids delays and wrong deliveries. For SUS447J1 we recommend stating:
- Standard and edition: JIS G 4305:2021 (cold rolled) or JIS G 4304:2021 (hot rolled), grade SUS447J1.
- 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 SUS447J1 plate
Table 18 of JIS G4305 calculates plate mass from the basic mass in Table 19, which for SUS447J1 is 7.64 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 |
|---|---|---|
| SUS447J1, 3.0 × 1 219 × 2 438 mm | 7.64 × 3.0 × (1.219 × 2.438) | about 68.1 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 SUS447J1
As a SUS447J1 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 |
|---|---|---|
| Grade availability | Few mills produce super-ferritic sheet. | Mill capability is confirmed before quotation. |
| Interstitials | Carbon or nitrogen above the very low limits reduces toughness. | Carbon and nitrogen are checked on the certificate. |
| Thickness | Super-ferritic grades are mainly made as thin sheet. | Available thickness is confirmed with the mill at enquiry. |
| 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 SUS447J1 equivalent to?
- GB/T 20878 Table C.1 cross-references SUS447J1 to the Chinese grade 008Cr30Mo2 (ISC S13091) and to ISO X1CrMo30-2, with EN 1.4135 shown in brackets as a related number, and lists no equivalent in ASTM A240; the 29Cr-4Mo grades such as S44700 have more molybdenum and are different steels. Any substitution must be approved by the designer. SHH STEEL compares the limits and can supply SUS447J1 or 008Cr30Mo2 with the matching certificate, and confirms the available thickness range with the mill at enquiry. Every SUS447J1 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 SUS447J1?
- JIS G4305:2021 sets the following heat-analysis limits for SUS447J1: Carbon (C) ≤ 0.010; Silicon (Si) ≤ 0.40; Manganese (Mn) ≤ 0.40; Phosphorus (P) ≤ 0.030; Sulphur (S) ≤ 0.020; Chromium (Cr) 28.50 – 32.00; Molybdenum (Mo) 1.50 – 2.50; Nitrogen (N) ≤ 0.015; Nickel, copper Ni ≤ 0.50, Cu ≤ 0.20, Ni + Cu ≤ 0.50. The very low carbon and nitrogen are essential for this super-ferritic grade. 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 SUS447J1 plate?
- In the annealed condition, JIS G4305 Table 11 requires SUS447J1 to have a 0.2 % proof stress of at least 295 N/mm², a tensile strength of at least 450 N/mm² and an elongation of at least 22 %. Hardness must not exceed 207 HBW; 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. This is a higher proof stress than SUS444. 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 SUS447J1 heat treated?
- Annex JA of JIS G4305 gives annealing at 900 – 1 050 °C with rapid cooling as the example heat treatment for SUS447J1. 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. Rapid cooling is used for high-chromium ferritic steel to avoid embrittlement at intermediate temperatures. SHH STEEL supplies SUS447J1 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 SUS447J1 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 SUS447J1, 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.
- Is SUS447J1 magnetic?
- Yes. SUS447J1 is a ferritic stainless steel, and ferritic grades are magnetic in all conditions because their structure is body-centred cubic ferrite. This makes ferritic sheet suitable for uses such as induction cooking surfaces and magnetic holding, and it means a magnet cannot be used to tell SUS447J1 from other ferritic or martensitic grades. Its 30 % chromium does not change this. Ferritic sheet also does not work-harden as strongly as austenitic sheet, so its magnetic response stays much the same after forming. Grade checks should rely on the certificate and positive material identification, which SHH STEEL can carry out before shipment. 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 SUS447J1 Steel Plate (447J1 stainless steel) is the 30 % chromium, 2 % molybdenum super-ferritic grade of JIS G4305, used for waterfront roofing and organic acid and caustic soda plants. 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 SUS447J1 requirement.
Quality Steel Needed? Inquire for Offers
Related Products
