GB/T 4237 022Cr23Ni5Mo3N S22053 Stainless Steel Plate Supplier

022Cr23Ni5Mo3N is the tight-chemistry 2205, UNS S32205: Cr 22.00–23.00%, Mo 3.00–3.50%, N 0.14–0.20%. About half ferrite and half austenite, it doubles the proof strength of 316L (450 MPa minimum) and, with PREN ≥34, resists pitting and chloride stress corrosion cracking far better.

How to read the name: under GB/T 20878 the leading ‘022’ is the carbon code (here C ≤0.030%), then Cr23 = about 23% chromium; Ni5 = about 5% nickel; Mo3 = about 3% molybdenum; N = nitrogen added. S22053 is the unified numeric code (ISC) used in GB/T 4237-2015.

SHH STEEL produces and exports austenitic-ferritic (duplex) stainless plate from China, works as a sales agent for leading stainless mills, and runs its own processing warehouse for cutting and surface finishing. 022Cr23Ni5Mo3N is part of our GB/T 4237 stainless plate range; for comparison, see our ASTM A240 Type 2205 page.

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.

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 16.

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 022Cr23Ni5Mo3N 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.

Duplex minimums are roughly twice those of 316L, which is why duplex vessels can be thinner.

Duplex grades combine high pitting resistance (PREN 30–36) with strong resistance to chloride stress corrosion cracking, which is the classic failure of 304/316 in warm chloride water.

PREN of 022Cr23Ni5Mo3N from the GB/T 4237 limits: 34.1 – 35.9. PREN is a ranking tool for pitting in chlorides, not a guarantee; temperature, crevices, deposits and weld finish matter as much.

Intergranular corrosion testing is not compulsory for this grade in GB/T 4237-2015; when required, the method (GB/T 4334, ASTM A262 or A923 for duplex) and acceptance are agreed in the order.

If service is harsher than 022Cr23Ni5Mo3N can handle, the next step up in this batch is GB/T 4237 022Cr25Ni7Mo4N S25073.

Duplex plate is about half ferrite and half austenite after solution annealing. Ferrite gives strength and resistance to stress corrosion cracking; austenite gives toughness and weldability. Mills measure the balance on each heat, and most project specifications ask for 35–65% ferrite in plate.

Two temperature limits apply to all duplex grades. Above about 250–300 °C long-term service causes 475 °C embrittlement, so ASME limits duplex to that range. At low temperature duplex has a ductile-brittle transition, so impact testing is normally specified at −40 °C or −46 °C for offshore plate.

Weight saving: with roughly double the proof strength of 316L, duplex shells and tanks can often be 30–40% thinner. That is the real cost case for 022Cr23Ni5Mo3N, not the price per tonne.

Target 35–65% ferrite in weld and HAZ. Use ER2209/E2209 filler, heat input about 0.5–2.5 kJ/mm and interpass ≤150 °C. Argon with 1–2% N2 helps keep nitrogen in root passes.

Too little heat input gives a ferritic, brittle HAZ; too much, or slow cooling, forms sigma and chi phases. Qualify the procedure with ferrite measurement, Charpy at −40 °C and ASTM A923 or G48 tests when the end user asks.

Cutting: we cut 022Cr23Ni5Mo3N 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.

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 2205, ASME SA240 2205, JIS G4305 SUS329J3L, AISI 329. See also our ASTM A240/A240M and JIS G4305 plate lists.

The table compares 022Cr23Ni5Mo3N with the grades buyers most often weigh it against. Strength values are GB/T 4237-2015 minimums; PREN is calculated from the minimum chemistry.

Duplex needs controlled welding: heat input roughly 0.5–2.5 kJ/mm, interpass ≤150 °C, ER2209 filler with nitrogen-bearing shielding, and a ferrite check (30–65% is typical acceptance). Avoid service above about 250–300 °C because of 475 °C embrittlement.

Recommended heat treatment for 022Cr23Ni5Mo3N (GB/T 4237-2015 Annex C): 1 040 – 1 100 °C, water quench (or rapid cooling for thin sections).

Solution annealing sets the austenite/ferrite balance (target 40–60% ferrite). Water quench prevents sigma (700–950 °C) and 475 °C embrittlement.

Typical duplex applications:

• Chemical tankers and storage tanks
• Oil and gas separators, flowline and process vessels
• Pulp digesters and bleach plant equipment
• Desalination (MSF/MED) evaporators
• FGD absorbers
• Bridges, piers and structural parts in marine air

Buyers specifying 022Cr23Ni5Mo3N for these jobs often compare it with GB/T 4237 022Cr22Ni5Mo3N S22293 and GB/T 4237 022Cr22Mn3Ni2MoN S22253; the comparison table on this page shows the differences.

International grade pages for the alternatives mentioned above: ASTM A240 Type 2507, ASTM A240 Type 2304, ASTM A240 Type 316L, ASTM A240 Type 2304.

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 (7.8 g/cm³). A 10 mm 022Cr23Ni5Mo3N plate weighs about 78.0 kg/m²; a 1 500 × 6 000 × 10 mm plate about 702 kg.

• Heat chemical analysis on every heat; product analysis by agreement
• Tensile test (Rp0.2, Rm, A) per batch
• Hardness test
• Ferrite content measurement
• ASTM A923 Method A/B/C for intermetallic phases when specified
• Charpy V-notch impact at −40 °C or −46 °C when specified
• 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.

• Standard and edition: GB/T 4237-2015
• Grade and code: 022Cr23Ni5Mo3N (S22053); 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.

022Cr23Ni5Mo3N 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.

• Mill-direct prices with our own export documentation
• Own processing warehouse: cutting, bevelling, polishing, PVC film
• PMI and dimensional check before packing
• Mixed-grade shipments across our AISI stainless and GB/T plate ranges
• Technical answers from people who read the standard, not just the price list

SHH STEEL has exported stainless and carbon steel plate to buyers in Asia, the Middle East, Africa, Europe and the Americas.

GB/T 4237 022Cr23Ni5Mo3N (S22053) is a standard duplex plate grade, known internationally as 2205 (S32205). It is defined by Table 16 chemistry (C ≤ 0.030, Cr 22.00 – 23.00, Ni 4.50 – 6.50, Mo 3.00 – 3.50, N 0.14 – 0.20) and Table 21 properties of at least 450 MPa proof strength and 655 MPa tensile strength. Typical uses include chemical tankers and storage tanks, oil and gas separators, flowline and process vessels and pulp digesters and bleach plant equipment. Duplex needs controlled welding: heat input roughly 0.5–2.5 kJ/mm, interpass ≤150 °C, ER2209 filler with nitrogen-bearing shielding, and a ferrite check (30–65% is typical acceptance).

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 022Cr23Ni5Mo3N 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 022Cr22Ni5Mo3N S22293 and GB/T 4237 022Cr25Ni7Mo4N S25073, our GB/T 4237 category and the ASTM A240 Type 2205 page. Send your sizes and quantities for a quotation.