GB/T 4237 04Cr13Ni5Mo S41595 Stainless Steel Plate Supplier
04Cr13Ni5Mo S41595 plate at a glance
04Cr13Ni5Mo is the 13Cr-4Ni soft martensitic grade (UNS S41500, EN 1.4313): C ≤0.05%, Ni 3.5–5.5%, Mo 0.5–1.0%. Low carbon and nickel give a tough, weldable martensite with 620 MPa minimum proof strength, which is why it is the standard for hydro turbines.
How to read the name: under GB/T 20878 the leading ’04’ is the carbon code (here C ≤0.05%), then Cr13 = about 13% chromium; Ni5 = about 5% nickel; Mo = molybdenum added. S41595 is the unified numeric code (ISC) used in GB/T 4237-2015.
SHH STEEL produces and exports martensitic stainless plate from China, works as a sales agent for leading stainless mills, and runs its own processing warehouse for cutting and surface finishing. 04Cr13Ni5Mo is part of our GB/T 4237 stainless plate range; for comparison, see our ASTM A240 S41500 page.
GB/T 4237 04Cr13Ni5Mo specification details
| Item | GB/T 4237-2015 requirement / SHH STEEL supply |
|---|---|
| Standard | GB/T 4237-2015 Hot rolled stainless steel plate, sheet and strip (current edition, replaces GB/T 4237-2007) |
| Grade / unified code | 04Cr13Ni5Mo / S41595 |
| Steel class | Martensitic |
| Chemical composition | Table 18 (heat analysis); product analysis per GB/T 222 |
| Mechanical properties | Table 23 |
| Product forms | Hot-rolled thick plate (3.0 – 200 mm in the standard), hot-rolled wide strip and cut plate (2.0 – 25.4 mm) |
| Our usual thickness range | 3 – 100 mm |
| Delivery condition | Not fixed in Annex C; normally quenched and tempered (≈ 950 – 1 050 °C + 560 – 620 °C) by agreement |
| Surface | Hot rolled, heat treated, pickled (No.1 / 1D) as standard; ground or polished by agreement |
| Density | 7.75 g/cm³ |
| Certificate | EN 10204 3.1 mill certificate; 3.2 with third-party inspection on request |
Sister grades on the same standard are listed under GB/T 4237; cold-rolled sheet of the same chemistry is ordered to GB/T 3280, and all our plate lines sit in stainless steel sheets and plates.
Chemical composition of 04Cr13Ni5Mo S41595
| Element | 04Cr13Ni5Mo heat analysis, % (Table 18) | Why it matters |
|---|---|---|
| C | ≤ 0.05 | Carbon. Low values protect welds from carbide precipitation; higher values add hot strength or hardenability. |
| Si | ≤ 0.60 | Silicon. Deoxidizer; in heat-resistant grades it builds a protective scale. |
| Mn | 0.50 – 1.00 | Manganese. Deoxidizer; in Mn-bearing grades it replaces nickel and keeps nitrogen in solution. |
| P | ≤ 0.030 | Phosphorus. Impurity, kept low for toughness and weld cracking resistance. |
| S | ≤ 0.030 | Sulfur. Impurity; low sulfur improves pitting resistance, hot workability and polishability. |
| Cr | 11.50 – 14.00 | Chromium. Forms the passive film; the main driver of corrosion and oxidation resistance. |
| Ni | 3.50 – 5.50 | Nickel. Stabilizes austenite, improves toughness and resistance to reducing acids. |
| Mo | 0.50 – 1.00 | Molybdenum. Raises pitting and crevice resistance in chlorides (×3.3 in PREN). |
| PREN (Cr + 3.3Mo + 16N) | 13.2 – 15.2 (minimum – mid-range) | Calculated from the limits above, not a requirement of GB/T 4237 |
Values are maximum unless a range is given. The mill reports the ladle (heat) analysis on the certificate; this is the figure to compare with Table 18.
Check analysis of 04Cr13Ni5Mo plate
A check analysis drilled from the finished plate may differ slightly from the heat analysis. GB/T 4237 refers to GB/T 222 for the permitted deviations; the table applies them to the 04Cr13Ni5Mo limits. Deviations apply to one side of a range only, never to both sides in the same heat.
| Element | Heat analysis limit (%) | Permitted deviation | Product analysis limit (%) |
|---|---|---|---|
| C | ≤ 0.05 | ±0.01 | ≤ 0.06 |
| Si | ≤ 0.60 | ±0.05 | ≤ 0.65 |
| Mn | 0.50 – 1.00 | ±0.03 | 0.47 – 1.03 |
| P | ≤ 0.030 | +0.005 | ≤ 0.035 |
| S | ≤ 0.030 | +0.005 | ≤ 0.035 |
| Cr | 11.50 – 14.00 | ±0.15 | 11.35 – 14.15 |
| Ni | 3.50 – 5.50 | ±0.07 (min) / ±0.10 (max) | 3.43 – 5.60 |
| Mo | 0.50 – 1.00 | ±0.03 (min) / ±0.05 (max) | 0.47 – 1.05 |
Where the table says ‘by agreement’, the deviation is not tabulated for that content level and should be agreed in the contract, usually by reference to ASTM A480 Table A1.1.
Mechanical properties at room temperature
| Property | 04Cr13Ni5Mo (Table 23) |
|---|---|
| Proof strength Rp0.2, MPa | ≥ 620 |
| Tensile strength Rm, MPa | ≥ 795 |
| Elongation A, % | ≥ 15 |
| Hardness HBW | ≤ 302 |
| Hardness HRC | ≤ 32 |
Values are for the annealed delivery condition. Hardened and tempered strength depends on the heat treatment chosen by the user.
How 04Cr13Ni5Mo plate is heat treated
Recommended heat treatment for 04Cr13Ni5Mo (GB/T 4237-2015 Annex C): Not fixed in Annex C; normally quenched and tempered (≈ 950 – 1 050 °C + 560 – 620 °C) by agreement.
Martensitic plate is delivered annealed for machinability. Users harden by austenitizing (about 950–1 050 °C), quenching in oil or air, and tempering to the required hardness.
How the martensitic grade is hardened
04Cr13Ni5Mo is delivered annealed. To reach high strength, the user austenitizes, quenches and tempers it. Tempering between about 400 and 550 °C should be avoided for 12Cr13-type steels because of temper embrittlement and lower corrosion resistance.
Harden after rough machining and before final grinding. Thick plate needs time at temperature (about 30 min per 25 mm) for uniform transformation.
For welded, tough parts the low-carbon 13-4 grade GB/T 4237 12Cr13 S41010 is the usual alternative.
04Cr13Ni5Mo equivalent grades: ASTM, EN, JIS
| Standard system | Equivalent / closest grade |
|---|---|
| China GB/T 4237-2015 | 04Cr13Ni5Mo (S41595) |
| ASTM A240/A240M | S41500 |
| EN 10088-2 | X3CrNiMo13-4 / 1.4313 |
| JIS G4304 (hot rolled) | — |
| Common name | F6NM / CA6NM-type 13-4 |
Equivalent grades are close in chemistry and properties but are never identical: limits on carbon, nitrogen and residual elements differ. For dual or multiple certification the heat must meet every standard named on the order, and we confirm that from the heat chemistry before quotation.
Related pages: ASTM A240 S41500, ASME SA240 S41500. See also our ASTM A240/A240M and JIS G4305 plate lists.
Fabrication guidance
Martensitic plate must be preheated (about 200–300 °C for 12Cr13, about 100–150 °C for 13-4 grades) and tempered after welding to avoid cold cracking.
Use matching filler (ER410, ER410NiMo for 13-4) when the weld must harden like the base metal, or austenitic ER309L for repair welds that do not need hardness.
Cold forming is limited; annealed plate can be bent with generous radii.
How 04Cr13Ni5Mo performs in corrosive service
Martensitic grades have modest corrosion resistance, best in the hardened and tempered, polished condition. They are chosen for strength and wear rather than corrosion.
PREN of 04Cr13Ni5Mo from the GB/T 4237 limits: 13.2 – 15.2. PREN is a ranking tool for pitting in chlorides, not a guarantee; temperature, crevices, deposits and weld finish matter as much.
Intergranular corrosion testing of ferritic and martensitic plate is by agreement (GB/T 4334 or ASTM A763 practices).
If service is harsher than 04Cr13Ni5Mo can handle, the next step up in this batch is GB/T 4237 022Cr23Ni5Mo3N S22053.
Applications of 04Cr13Ni5Mo plate
Typical uses (most after hardening):
- Hydro turbine runners, guide vanes and wicket gates
- Pump impellers and casings
- Compressor parts
- Valve bodies for oil and gas
Buyers specifying 04Cr13Ni5Mo for these jobs often compare it with GB/T 4237 12Cr13 S41010 and GB/T 4237 022Cr23Ni5Mo3N S22053; the comparison table on this page shows the differences.
International grade pages for the alternatives mentioned above: ASTM A240 Type 410, ASTM A240 Type 410S, ASTM A240 Type 2205.
Other GB/T 4237 grades buyers request alongside it: GB/T 4237 022Cr12Ni9Cu2NbTi S51290, GB/T 4237 04Cr13Ni8Mo2Al S51380.
Choosing between 04Cr13Ni5Mo and its neighbours
The table compares 04Cr13Ni5Mo with the grades buyers most often weigh it against. Strength values are GB/T 4237-2015 minimums; PREN is calculated from the minimum chemistry.
| Grade (GB/T 4237) | Key chemistry, % | PREN min | Rp0.2 min, MPa | Rm min, MPa |
|---|---|---|---|---|
| 04Cr13Ni5Mo S41595 | C ≤ 0.05, Cr 11.50 – 14.00, Ni 3.50 – 5.50, Mo 0.50 – 1.00, Mn 0.50 – 1.00 | 13.2 | 620 | 795 |
| GB/T 4237 12Cr13 S41010 | C ≤ 0.15, Cr 11.50 – 13.50, Ni ≤ 0.60 | 11.5 | 205 | 450 |
| GB/T 4237 06Cr13 S41008 | C ≤ 0.08, Cr 11.50 – 13.50, Ni ≤ 0.60 | 11.5 | 205 | 415 |
| GB/T 4237 022Cr23Ni5Mo3N S22053 | C ≤ 0.030, Cr 22.00 – 23.00, Ni 4.50 – 6.50, Mo 3.00 – 3.50, N 0.14 – 0.20 | 34.1 | 450 | 655 |
Supplied normalized and tempered (or quenched and tempered). For sour service (NACE MR0175) a double temper and hardness ≤23 HRC are usually required; agree this in the order.
Surface finish and processing
| Finish | Description | Availability for this grade |
|---|---|---|
| No.1 / 1D | Hot rolled, heat treated, pickled; the GB/T 4237 standard surface | Standard |
| Shot-blasted + pickled | Uniform matte for welded structures | On request |
| No.4 / brushed | Abrasive finish, grit 150–180 | Warehouse processing, thin plate |
| HL (hairline) | Long continuous lines, decorative | Warehouse processing, thin plate |
| 8K mirror | Polished reflective finish | Warehouse processing, limited sizes |
| 2B / BA | Cold-rolled finishes (ordered as GB/T 3280 sheet, not hot-rolled plate) | Sheet only |
Our warehouse cuts plate to size (plasma, laser, waterjet, saw), bevels weld edges, polishes and applies PVC protective film. Processed plate ships with the original mill heat number marked. Ask for cut pieces of other stainless steel products at the same time to consolidate freight.
04Cr13Ni5Mo plate sizes
| Dimension | Typical supply |
|---|---|
| Thickness | 3 – 100 mm |
| Width | 1 000 / 1 219 / 1 250 / 1 500 / 1 800 / 2 000 mm; wider by mill order |
| Length | 2 000 / 2 438 / 3 000 / 6 000 mm or cut to size |
| Flatness | Per GB/T 4237; ≤15 mm per metre for plate up to 25 mm unless agreed tighter |
| Thickness tolerance | Per the GB/T 4237 dimensional tolerance tables (normal or higher accuracy as ordered) |
| Edge | Mill edge or cut edge |
Weight: plate mass in kg/m² = thickness (mm) × density (7.75 g/cm³). A 10 mm 04Cr13Ni5Mo plate weighs about 77.5 kg/m²; a 1 500 × 6 000 × 10 mm plate about 698 kg.
Inspection, tests and mill certificates
- Heat chemical analysis on every heat; product analysis by agreement
- Tensile test (Rp0.2, Rm, A) per batch
- Hardness test
- Ultrasonic testing (NB/T 47013.3 or ASTM A578) when specified
- Positive material identification (PMI) on every plate leaving our warehouse
- Visual and dimensional inspection; third-party inspection (SGS, BV, TÜV, Intertek) at the buyer’s request
Certificates follow EN 10204 3.1 as standard. Where plate is also certified to ASME SA240 or ASTM A240, both standards are shown on one certificate.
How to order
- Standard and edition: GB/T 4237-2015
- Grade and code: 04Cr13Ni5Mo (S41595); add the equivalent if dual certification is needed
- Thickness × width × length, quantity in pieces or tonnes
- Thickness tolerance class and flatness if tighter than standard
- Surface finish and protective film
- Tests beyond the standard (IGC, UT, impact, ferrite, PMI, grain size)
- Certificate type (EN 10204 3.1 / 3.2) and inspection body
- Marking, packing (wooden cases, steel pallets) and delivery terms
Send the list to SHH STEEL and we return a quotation with mill, lead time and stock options. Other grades from the same standard can be combined in one shipment; browse GB/T 4237 plate grades.
Supply chain and lead time
04Cr13Ni5Mo is a mainstream grade at Chinese stainless mills. We supply it from our own stock and processing warehouse, and by mill order from major producers such as TISCO and Baosteel Stainless, for which we act as a sales agent. Stock plate ships in about 1–2 weeks after cutting; mill orders typically take 30–60 days depending on thickness and rolling schedule.
Every plate is traceable to its heat number, and copies of the mill certificates stay on file for repeat orders and audits. The same mills also supply our ASTM A240, ASME SA240, JIS G4305 and AISI plate ranges, so mixed-standard orders can ship together.
FAQ
- What is 04Cr13Ni5Mo equivalent to?
- 04Cr13Ni5Mo (S41595) corresponds to ASTM A240 UNS S41500 and EN 1.4313 X3CrNiMo13-4, often called 13-4 or F6NM (wrought equivalent of CA6NM castings). GB/T 4237-2015 minimums: 620 MPa proof, 795 MPa tensile, 15% elongation, HRC ≤32.
- What is the chemical composition of 04Cr13Ni5Mo?
- Under GB/T 4237-2015 Table 18, 04Cr13Ni5Mo (S41595) has C ≤ 0.05, Cr 11.50 – 14.00, Ni 3.50 – 5.50, Mo 0.50 – 1.00, Mn 0.50 – 1.00. Phosphorus is limited to ≤0.030% and sulfur to ≤0.030%.
- What are the mechanical properties of 04Cr13Ni5Mo plate?
- GB/T 4237-2015 Table 23 requires for 04Cr13Ni5Mo: proof strength Rp0.2 ≥620 MPa, tensile strength ≥795 MPa and elongation ≥15%, hardness ≤302 HBW. Values apply to plate in the delivery heat-treated condition.
- Is 04Cr13Ni5Mo stainless steel magnetic?
- Yes. 04Cr13Ni5Mo is martensitic and is magnetic in all conditions.
- What thickness of 04Cr13Ni5Mo plate can you supply?
- Under GB/T 4237 we supply 04Cr13Ni5Mo hot-rolled plate in 3 – 100 mm, widths up to 2 000 mm (wider by mill order), cut to size in our warehouse. Thinner material is cold-rolled sheet to GB/T 3280.
- What is the PREN of 04Cr13Ni5Mo?
- Using PREN = Cr + 3.3Mo + 16N and the GB/T 4237-2015 limits, 04Cr13Ni5Mo has a PREN of about 13.2 at minimum chemistry and 15.2 at mid-range.
Conclusion
GB/T 4237 04Cr13Ni5Mo (S41595) is a martensitic plate grade, known internationally as S41500 / 13-4. It is defined by Table 18 chemistry (C ≤ 0.05, Cr 11.50 – 14.00, Ni 3.50 – 5.50, Mo 0.50 – 1.00, Mn 0.50 – 1.00) and Table 23 properties of at least 620 MPa proof strength and 795 MPa tensile strength. Typical uses include hydro turbine runners, guide vanes and wicket gates, pump impellers and casings and compressor parts. Supplied normalized and tempered (or quenched and tempered).
Before ordering, state the standard edition, the grade name with its code, and any extra tests, so that the mill certificate matches your design documents. SHH STEEL supplies 04Cr13Ni5Mo plate from stock and by mill order, cut to size and finished in our own warehouse, with EN 10204 3.1 certificates. For related grades see GB/T 4237 12Cr13 S41010 and GB/T 4237 06Cr13 S41008, our GB/T 4237 category and the ASTM A240 S41500 page. Send your sizes and quantities for a quotation.
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