GB/T 4237 019Cr19Mo2NbTi S11972 Stainless Steel Plate Supplier

019Cr19Mo2NbTi is 444 (EN 1.4521): 17.5–19.5% chromium and 1.75–2.50% molybdenum with Ti+Nb stabilization. Its PREN of about 23–25 matches 316L, while the ferritic structure makes it practically immune to chloride stress corrosion cracking.

Reading the designation: ‘019’ gives the carbon level (C ≤0.025% in GB/T 4237), followed by Cr19 = about 19% chromium; Mo2 = about 2% molybdenum; Nb = niobium added; Ti = titanium added. S11972 is the unified numeric code (ISC) used in GB/T 4237-2015. Older drawings and Chinese buyers may still write the pre-2007 name 00Cr18Mo2.

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. 019Cr19Mo2NbTi is part of our GB/T 4237 stainless plate range; for comparison, see our ASTM A240 Type 444 page.

Molybdenum and higher chromium bring ferritic grades up to 304–316L pitting resistance while keeping freedom from chloride stress corrosion cracking.

PREN of 019Cr19Mo2NbTi from the GB/T 4237 limits: 23.3 – 25.5. 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 019Cr19Mo2NbTi can handle, the next step up in this batch is GB/T 4237 019Cr23Mo2Ti S12361.

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.

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 019Cr19Mo2NbTi limits. Deviations apply to one side of a range only, never to both sides in the same heat.

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.

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.

019Cr19Mo2NbTi 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).

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 Type 444, ASME SA240 444, JIS G4305 SUS444, AISI 444. See also our ASTM A240/A240M and JIS G4305 plate lists.

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 019Cr19Mo2NbTi 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.

The table compares 019Cr19Mo2NbTi with the grades buyers most often weigh it against. Strength values are GB/T 4237-2015 minimums; PREN is calculated from the minimum chemistry.

Thick 444 plate loses toughness and is rare; most supply is 3–6 mm. Welding with 316L filler is common but weld metal then becomes austenitic; for matched behaviour use a 444-type filler.

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.

Recommended heat treatment for 019Cr19Mo2NbTi (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.

Typical uses:

• Hot water cylinders and solar water heaters
• Heat exchangers in chloride water
• Architectural cladding in coastal sites
• Food processing equipment
• Exhaust parts

Buyers specifying 019Cr19Mo2NbTi for these jobs often compare it with GB/T 4237 022Cr18Ti S11863 and GB/T 4237 10Cr17 S11710; the comparison table on this page shows the differences.

International grade pages for the alternatives mentioned above: ASTM A240 Type 439, ASTM A240 Type 316L, ASTM A240 Type 430.

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.

Weight: plate mass in kg/m² = thickness (mm) × density (7.7 g/cm³). A 10 mm 019Cr19Mo2NbTi plate weighs about 77.0 kg/m²; a 1 500 × 6 000 × 10 mm plate about 693 kg.

• 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.

019Cr19Mo2NbTi 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.

• Standard and edition: GB/T 4237-2015
• Grade and code: 019Cr19Mo2NbTi (S11972); 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.

GB/T 4237 019Cr19Mo2NbTi (S11972) is a molybdenum or high-chromium ferritic plate grade, known internationally as 444. It is defined by Table 17 chemistry (C ≤ 0.025, Cr 17.50 – 19.50, Ni ≤ 1.00, Mo 1.75 – 2.50, N ≤ 0.035) and Table 22 properties of at least 275 MPa proof strength and 415 MPa tensile strength. Typical uses include hot water cylinders and solar water heaters, heat exchangers in chloride water and architectural cladding in coastal sites. Thick 444 plate loses toughness and is rare; most supply is 3–6 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 019Cr19Mo2NbTi 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 022Cr18Ti S11863 and GB/T 4237 019Cr23Mo2Ti S12361, our GB/T 4237 category and the ASTM A240 Type 444 page. Send your sizes and quantities for a quotation.