GB/T 4237 019Cr21CuTi S12182 Stainless Steel Plate Supplier
What is GB/T 4237 019Cr21CuTi (S12182) stainless steel plate?
019Cr21CuTi is the 21% chromium copper-bearing ferritic known as 443 / SUS443J1: Cr 20.5–23%, Cu 0.30–0.80%, Ti stabilized. It was developed in Japan as a nickel-free alternative to 304 with similar general corrosion resistance.
Reading the designation: ‘019’ gives the carbon level (C ≤0.025% in GB/T 4237), followed by Cr21 = about 21% chromium; Cu = copper added; Ti = titanium added. S12182 is the unified numeric code (ISC) used in GB/T 4237-2015.
SHH STEEL produces and exports ferritic stainless plate from China, works as a sales agent for leading stainless mills, and runs its own processing warehouse for cutting and surface finishing. 019Cr21CuTi is part of our GB/T 4237 stainless plate range; for comparison, see our JIS G4305 SUS443J1 page.
Corrosion behaviour and intergranular corrosion tests
Molybdenum and higher chromium bring ferritic grades up to 304–316L pitting resistance while keeping freedom from chloride stress corrosion cracking.
PREN of 019Cr21CuTi from the GB/T 4237 limits: 20.5 – 21.8. 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 019Cr21CuTi can handle, the next step up in this batch is GB/T 4237 019Cr23MoTi S12362.
Heat analysis limits for 019Cr21CuTi
| Element | 019Cr21CuTi heat analysis, % (Table 17) | Why it matters |
|---|---|---|
| C | ≤ 0.025 | Carbon. Low values protect welds from carbide precipitation; higher values add hot strength or hardenability. |
| Si | ≤ 1.00 | Silicon. Deoxidizer; in heat-resistant grades it builds a protective scale. |
| Mn | ≤ 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 | 20.50 – 23.00 | Chromium. Forms the passive film; the main driver of corrosion and oxidation resistance. |
| Cu | 0.30 – 0.80 | Copper. Improves resistance to sulfuric acid and, in ferritics, general corrosion and formability. |
| N | ≤ 0.025 | Nitrogen. Strengthens, stabilizes austenite and adds pitting resistance (×16 in PREN). |
| Other | Ti, Nb, Zr or their combination: 8 × (C+N) – 0.80 | Stabilizing / special-element requirement of the standard |
| PREN (Cr + 3.3Mo + 16N) | 20.5 – 21.8 (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 17.
Check analysis of 019Cr21CuTi 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 019Cr21CuTi 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 | ≤ 0.025 | +0.005 | ≤ 0.030 |
| Si | ≤ 1.00 | ±0.05 | ≤ 1.05 |
| Mn | ≤ 1.00 | ±0.03 | ≤ 1.03 |
| P | ≤ 0.030 | +0.005 | ≤ 0.035 |
| S | ≤ 0.030 | +0.005 | ≤ 0.035 |
| Cr | 20.50 – 23.00 | ±0.25 | 20.25 – 23.25 |
| Cu | 0.30 – 0.80 | ±0.03 (min) / ±0.05 (max) | 0.27 – 0.85 |
| N | ≤ 0.025 | ±0.01 | ≤ 0.035 |
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 of 019Cr21CuTi plate
| Property | 019Cr21CuTi (Table 22) |
|---|---|
| Proof strength Rp0.2, MPa | ≥ 205 |
| Tensile strength Rm, MPa | ≥ 390 |
| Elongation A, % | ≥ 22 |
| Hardness HBW | ≤ 192 |
| Hardness HRB | ≤ 90 |
| Hardness HV | ≤ 200 |
| 180° bend (cold) | D=2a, no cracks on the outer surface |
Values apply to plate in the delivery heat-treated condition, tested transversely per GB/T 228.1. Hardness is checked by one method chosen by the mill.
Ferritic behaviour: magnetism, toughness and thickness
019Cr21CuTi is ferritic: it is magnetic, has lower thermal expansion and better thermal conductivity than austenitic steel, and is immune to chloride stress corrosion cracking. Those properties make it a good choice for heat exchangers, hot water tanks and exhaust parts.
The trade-off is toughness. Ferritic stainless has a ductile-brittle transition, and it moves to higher temperature with thickness and grain size. This is why ferritic plate is mostly thin; for sections above about 6 mm ask for Charpy data or bend in a warm shop.
Ferritic grades contain little or no nickel, so their price is far more stable than GB/T 4237 06Cr19Ni10 S30408 (304).
International equivalents of 019Cr21CuTi S12182
| Standard system | Equivalent / closest grade |
|---|---|
| China GB/T 4237-2015 | 019Cr21CuTi (S12182) |
| ASTM A240/A240M | 443-type (S44330) |
| EN 10088-2 | — |
| JIS G4304 (hot rolled) | SUS443J1 |
| Common name | 443 |
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: JIS G4305 SUS443J1. See also our ASTM A240/A240M and JIS G4305 plate lists.
Fabrication guidance
Weld with ER316L, ER439Mo or a matching Mo-bearing ferritic filler. Shield the root with argon; nitrogen and carbon pick-up embrittle high-chromium ferritic welds.
Keep heat input low and avoid weaving; HAZ grain growth reduces toughness more than in austenitic grades.
Cutting: we cut 019Cr21CuTi by plasma (up to about 150 mm), laser (thin plate) or waterjet, and remove the heat-affected edge by machining where the drawing requires it.
Comparison with sister grades
The table compares 019Cr21CuTi 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 |
|---|---|---|---|---|
| 019Cr21CuTi S12182 | C ≤ 0.025, Cr 20.50 – 23.00, N ≤ 0.025, Cu 0.30 – 0.80 | 20.5 | 205 | 390 |
| GB/T 4237 019Cr18CuNb S11882 | C ≤ 0.025, Cr 16.00 – 20.00, Ni ≤ 0.60, N ≤ 0.025, Cu 0.30 – 0.80 | 16.0 | 205 | 390 |
| GB/T 4237 019Cr23MoTi S12362 | C ≤ 0.025, Cr 21.00 – 24.00, Mo 0.70 – 1.50, N ≤ 0.025, Cu ≤ 0.60 | 23.3 | 245 | 410 |
| GB/T 4237 022Cr18Ti S11863 | C ≤ 0.030, Cr 17.00 – 19.00, Ni ≤ 0.50, N ≤ 0.030 | 17.0 | 205 | 415 |
Thin-gauge grade: plate under GB/T 4237 is usually only to about 6 mm. Its corrosion resistance is in the 304 range, not 316.
Specification summary
| 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 | 019Cr21CuTi / S12182 |
| Steel class | Ferritic |
| Chemical composition | Table 17 (heat analysis); product analysis per GB/T 222 |
| Mechanical properties | Table 22 |
| 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 | 2 – 10 mm |
| Delivery condition | 800 – 1 050 °C, rapid cooling |
| Surface | Hot rolled, heat treated, pickled (No.1 / 1D) as standard; ground or polished by agreement |
| Density | 7.7 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.
Annealing / solution treatment
Recommended heat treatment for 019Cr21CuTi (GB/T 4237-2015 Annex C): 800 – 1 050 °C, rapid cooling.
Rapid cooling after annealing avoids sigma and 475 °C embrittlement in Mo-bearing high-Cr ferritics.
Applications of 019Cr21CuTi plate
Typical uses:
- Kitchen equipment and sinks
- Elevator and escalator panels
- Indoor architectural parts
- Appliances
Buyers specifying 019Cr21CuTi for these jobs often compare it with GB/T 4237 019Cr18CuNb S11882 and GB/T 4237 022Cr18Ti S11863; the comparison table on this page shows the differences.
International grade pages for the alternatives mentioned above: JIS G4305 SUS430J1, ASTM A240 Type 444, ASTM A240 Type 439.
Other GB/T 4237 grades buyers request alongside it: GB/T 4237 019Cr19Mo2NbTi S11972, GB/T 4237 019Cr18MoTi S11862, GB/T 4237 019Cr23Mo2Ti S12361.
Surface options and cut-to-size service
| 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.
Sizes, tolerances and weight
| Dimension | Typical supply |
|---|---|
| Thickness | 2 – 10 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 (7.7 g/cm³). A 10 mm 019Cr21CuTi plate weighs about 77.0 kg/m²; a 1 500 × 6 000 × 10 mm plate about 693 kg.
Quality documents supplied
- Heat chemical analysis on every heat; product analysis by agreement
- Tensile test (Rp0.2, Rm, A) per batch
- Hardness test
- 180° bend 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.
Supply chain and lead time
019Cr21CuTi is produced by a small number of Chinese mills with the melting and heat treatment capability for it. We place mill orders for it through the producers we represent and do not usually hold it in stock. Expect about 45–90 days, with minimum quantities per thickness; we can combine small quantities into one rolling where the mill allows.
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.
What to put on a 019Cr21CuTi purchase order
- Standard and edition: GB/T 4237-2015
- Grade and code: 019Cr21CuTi (S12182); 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.
FAQ
- Can 019Cr21CuTi replace 304?
- Often, for indoor or mild outdoor use. 019Cr21CuTi (S12182, 443 / SUS443J1) has Cr 20.50–23.00% with Cu and Ti, giving general corrosion resistance similar to 304, no nickel and no chloride stress corrosion cracking. It is magnetic and less formable.
- What is the chemical composition of 019Cr21CuTi?
- Under GB/T 4237-2015 Table 17, 019Cr21CuTi (S12182) has C ≤ 0.025, Cr 20.50 – 23.00, N ≤ 0.025, Cu 0.30 – 0.80; Ti, Nb, Zr or their combination: 8 × (C+N) – 0.80. Phosphorus is limited to ≤0.030% and sulfur to ≤0.030%.
- What is the ASTM equivalent of 019Cr21CuTi?
- The closest equivalents of 019Cr21CuTi (S12182) are 443-type (S44330) in ASTM, SUS443J1 in JIS (common name: 443). Chemistry limits differ slightly, so dual certification depends on the actual heat.
- What are the mechanical properties of 019Cr21CuTi plate?
- GB/T 4237-2015 Table 22 requires for 019Cr21CuTi: proof strength Rp0.2 ≥205 MPa, tensile strength ≥390 MPa and elongation ≥22%, hardness ≤192 HBW. Values apply to plate in the delivery heat-treated condition.
- Is 019Cr21CuTi stainless steel magnetic?
- Yes. 019Cr21CuTi is ferritic and is magnetic in all conditions.
- What thickness of 019Cr21CuTi plate can you supply?
- Under GB/T 4237 we supply 019Cr21CuTi hot-rolled plate in 2 – 10 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.
Conclusion
GB/T 4237 019Cr21CuTi (S12182) is a molybdenum or high-chromium ferritic plate grade, known internationally as 443. It is defined by Table 17 chemistry (C ≤ 0.025, Cr 20.50 – 23.00, N ≤ 0.025, Cu 0.30 – 0.80) and Table 22 properties of at least 205 MPa proof strength and 390 MPa tensile strength. Typical uses include kitchen equipment and sinks, elevator and escalator panels and indoor architectural parts. Thin-gauge grade: plate under GB/T 4237 is usually only to about 6 mm.
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 019Cr21CuTi plate by mill order through the producers we represent, cut to size and finished in our own warehouse, with EN 10204 3.1 certificates. For related grades see GB/T 4237 019Cr18CuNb S11882 and GB/T 4237 019Cr23MoTi S12362, our GB/T 4237 category and the JIS G4305 SUS443J1 page. Send your sizes and quantities for a quotation.
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