ASME SA203 Grade A Steel Plate | SA203 Gr.A 2.25Ni Vessel Plate

As a professional China mill-Direct Supply and ASME pressure-vessel plate exporter, SHH STEEL supplies ASME SA203 Grade A Steel Plate.

On drawings, MTCs and RFQs this grade is written many ways: ASME SA203 Grade A, SA203 Gr.A, SA203 Gr A, SA203GRA, SA203 GR A, SA-203 Grade A, SA-203 Gr.A, ASTM A203 Grade A, A203 Gr.A, A203GRA, 2.25Ni vessel plate and 2.25 nickel pressure vessel plate. All of these names refer to the same 2.25% nickel alloy plate. SA-203/SA-203M is the ASME Boiler and Pressure Vessel Code companion to ASTM A203/A203M.

SA203 Gr.A is specified for welded pressure vessels that need moderate- and low-temperature toughness above ordinary carbon vessel steels such as ASME SA516 and ASTM A516. Minimum yield is 255 MPa (37 ksi). Tensile strength is 450–585 MPa (65–85 ksi). Nickel heat analysis is 2.10–2.50%. Grades A, B, D and E are normalized. Steel is killed and produced to fine-grain practice under ASME SA-20 / ASTM A20.

SHH STEEL supplies SA203 Gr.A as true China mill-Direct Supply from Chinese mills rolling nickel vessel plate. Dual marking ASME SA203 Grade A / ASTM A203 Grade A is available when the equipment is registered to ASME Section VIII. Certificates can be EN 10204 3.1 or EN 10204 3.2.

If the project compares other coded vessel plates, SHH STEEL places SA203 Gr.A next to ASME SA537, ASTM A537, ASME SA515, ASTM A285 and ASME SA387 so nickel content, heat treatment and design temperature can be checked together.

This product belongs to the Pressure Vessel Steel Plates family. It is a 2.25Ni coded vessel plate, not a structural Carbon Steel Plates grade.

SA203 Grade A chemistry is reported as heat analysis (ladle analysis) and, when specified, product analysis, using the same limits as ASTM A203 Grade A.

Heat Analysis (Ladle Analysis) — Grade A

Product Analysis — Grade A

Heat-analysis nickel of 2.10–2.50% (product 2.03–2.57%) is the 2.25% nominal nickel grade. That nickel band is what separates SA203 Gr.A from ASME SA516. Tighter residuals or carbon equivalent limits are treated as supplementary requirements.

SHH STEEL reports ladle analysis on every certificate. Product analysis is added when the purchase order or the vessel specification requires it.

Tensile Requirements — ASME SA203 Grade A (SA203 Gr.A)

These values apply to Grade A at both thin and thick sizes. Density is 7.85 g/cm³. Hardness after normalizing is typically around 160 HB unless a special window is ordered.

SHH STEEL reports tensile results from specimens prepared under SA-20. If simulated PWHT is specified, coupons can be heat-treated to the vessel cycle before testing.

Order SA203 Gr.A / SA203GRA when the ASME drawing names Grade A and 255 MPa yield is enough. If the same 2.25Ni chemistry is required at 275 MPa, use Grade B. If MDMT needs 3.5Ni, use Grade D or E. Carbon QT vessel options include ASME SA537 and ASTM A537. HSLA Steel Plates are not a coded substitute for SA203.

Nickel in SA203 Gr.A improves notch toughness for ASME Section VIII vessels in moderate- and low-temperature service. It is not 9% Ni cryogenic plate.

Impact temperature, orientation and energy minimums are agreed on the order. When Grades A, B, D and E receive a cooling rate faster than air cooling and are then tempered at not less than 595°C, Charpy V-notch testing with a minimum average of 27 J (20 ft·lbf) is required. Many vessel specifications set a colder temperature or a higher energy average.

SHH STEEL can supply SA203 Gr.A 2.25Ni vessel plate with Charpy sets at the temperature written on the RFQ. Results are listed on the 3.1 or 3.2 certificate.

SA203 Grade A is specified as a welded pressure-vessel plate. Normalized 2.25Ni steel is welded with low-hydrogen procedures qualified to ASME Section IX.

Consumables are selected to match nickel and the required joint toughness. Preheat depends on thickness and restraint. When Section VIII requires PWHT, the shop cycle is commonly 595–650°C. If the fabricator needs properties after that cycle, simulated PWHT of mill coupons should be ordered before shipment.

SHH STEEL recommends a qualified WPS/PQR for each thickness break and can support procedure review through steel welding services.

All SA203 Grade A plates shall be normalized, except where the purchaser approves a faster cool plus temper at not less than 595°C to improve toughness. That optional route requires impact testing.

Normalizing is heating into the austenite range followed by air cooling. Grade F quench-and-temper practice must not be applied to Grade A unless the order is changed to Grade F.

If the specification fixes a normalizing temperature band or holding time per thickness, SHH STEEL writes those parameters into the mill instruction and reports them on the certificate.

SHH STEEL delivers ASME SA203 Grade A / SA203 Gr.A in the normalized condition as standard.

The certificate lists SA203 Gr.A and, when dual certified, A203 Gr.A; heat number; heat analysis; product analysis when ordered; tensile results; heat-treatment condition; agreed Charpy values; and supplementary tests. Plates are industrial vessel plate: heat-treated, then pickled or shot-blasted as agreed.

Decorative finishes such as 2B, BA or No.4 are not used. Surface condition is vessel-plate quality for welding, NDE and coating. Heat number and grade marking support ASME traceability.

Certificates may be EN 10204 3.1 or EN 10204 3.2. Third-party stamps (BV, LR, DNV, TUV, SGS or the purchaser’s agency) are arranged when written on the order.

Typical supply range from SHH STEEL for SA203 Gr.A 2.25Ni vessel plate:

• Thickness: 6 mm – 150 mm (heavier by mill enquiry)
• Width: up to about 4600 mm
• Length: up to about 12000 mm

Cut-to-length shells, heads and nest sizes are available. Extra-wide or extra-thick plates should be confirmed before the purchase order is issued.

Dimensional tolerances follow ASME SA-20 / ASTM A20 for pressure-vessel plates.

Thickness, width, length, flatness and camber are vessel-plate tolerances, not strip tolerances. Restricted thickness or extra-flatness can be accepted when the vessel drawing requires it. Ultrasonic testing to A435 or A578 is added when specified. Cutting to finished sizes is available through steel cutting services.

ASME vessel specifications often add tests beyond the base SA203 Grade A table. SHH STEEL treats the following as supplementary requirements.

Simulated PWHT. Coupons from the same heat and thickness receive the vessel PWHT cycle. Tensile and Charpy tests are run on those coupons.

Nondestructive examination. UT to A435, A577 or A578 with purchaser acceptance levels. Edge MT/PT after cutting if required.

Low-temperature impact. Test temperature, specimen size, orientation and minimum average/single values as written on the RFQ.

Special hardness. HBW or HV window after normalizing or after simulated PWHT.

Restricted chemistry. Tighter C, P, S, residuals or carbon equivalent on heat and product analysis.

HIC testing. NACE TM0284 with purchaser solution and CLR/CTR/CSR limits. Not automatic on SA203 Gr.A.

NACE / sour-service notes. Review against NACE MR0175 / ISO 15156 or MR0103 only when the datasheet cites the clause.

Z-direction testing. ASTM A770 or purchaser Z15/Z25/Z35 for thick nozzles and restrained joints.

Third-party witnessing. Witness of heat treatment, mechanical tests, UT and documents. Output can be EN 10204 3.2.

Supplementary tests go through steel testing service and appear line by line on the certificate. Items not on the purchase order are not assumed.

For ASME stamping, the purchase order should say ASME SA203 Grade A or dual SA203 / A203 Grade A. Nearby carbon vessel grades include ASME SA516, ASTM A516, ASME SA515 and ASTM A285.

ASME SA203 Grade A / SA203 Gr.A is selected for Section VIII vessels that need 2.25Ni toughness at 255 MPa yield. Typical applications of ASME SA203 Grade A Steel Plate include:

SHH STEEL supplies SA203 Gr.A with full heat traceability. Related industry pages include petrochemical industry and energy industry. Supporting services include steel cutting services, steel welding services, steel testing service and worldwide shipping service.

SHH STEEL is a China mill-Direct Supply for ASME pressure-vessel plates. For SA203 Grade A we offer:

• China mill-Direct Supply pricing on SA203 Gr.A / A203 Gr.A
• Dual ASME SA203 / ASTM A203 marking
• Heat analysis and product analysis
• EN 10204 3.1 standard; EN 10204 3.2 or nominated third-party inspection on request
• Normalized delivery with agreed Charpy temperature
• Supplementary PWHT simulation, UT, HIC, NACE review and Z-direction testing
• Cutting to shell and head nest sizes
• Technical support to separate Grade A from B/D/E/F and from SA516 / SA537
• Export packing through worldwide shipping service

For company scope and other vessel grades, visit China steel Mill Agent-SHH STEEL.

ASME SA203 Grade A Steel Plate is the 2.25% nickel, 255 MPa yield vessel grade under SA-203 and A203. Whether the inquiry says SA203 Gr.A, SA203GRA, SA-203 Grade A or 2.25Ni vessel plate, SHH STEEL supplies normalized plate with heat and product analysis, optional supplementary tests, and EN 10204 3.1 or 3.2 certification.

As a professional China mill-Direct Supply, SHH STEEL provides ASME SA203 Grade A / SA203 Gr.A 2.25Ni Vessel Plate with full traceability for ASME Section VIII fabrication.

Contact SHH STEEL today for stock, impact temperature, dual SA203/A203 marking, 3.2 inspection or a quotation.

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