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

As a professional China mill-Direct Supply and ASME pressure-vessel plate exporter, SHH STEEL supplies ASME SA203 Grade B Steel Plate produced to ASME SA-203/SA-203M.

On drawings, MTCs and RFQs this grade is written many ways: ASME SA203 Grade B, SA203 Gr.B, SA203 Gr B, SA203GRB, SA203 GR B, SA-203 Grade B, SA-203 Gr.B, ASTM A203 Grade B, A203 Gr.B, A203GRB, 2.25Ni vessel plate and 2.25 nickel pressure vessel plate. All of these names refer to the same 2.25% nickel alloy plate. ASME SA-203/SA-203M is the Boiler and Pressure Vessel Code companion to ASTM A203/A203M.

SA203 Gr.B uses the same nominal 2.25% nickel as Grade A, but at the next strength level in ASME SA-203: minimum yield 275 MPa (40 ksi) and tensile 485–620 MPa (70–90 ksi). Nickel improves notch toughness versus carbon vessel steels such as ASME SA516 (ASME SA-516/SA-516M) and ASTM A516. General requirements follow ASME SA-20. Grades A, B, D and E are normalized. Steel is killed and produced to fine-grain practice.

SHH STEEL supplies SA203 Gr.B as true China mill-Direct Supply. Dual marking ASME SA203 Grade B / ASTM A203 Grade B is available for equipment built 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.B next to ASME SA537 (SA-537), ASTM A537, ASME SA515 (SA-515), ASTM A285 and ASME SA387 (SA-387).

This product belongs to the Pressure Vessel Steel Plates family. It is a 2.25Ni coded vessel plate under ASME SA-203, not a structural Carbon Steel Plates grade.

SA203 Grade B chemistry under ASME SA-203/SA-203M is reported as heat analysis (ladle analysis) and, when specified, product analysis.

Heat Analysis (Ladle Analysis) — Grade B

Product Analysis — Grade B

Grade B allows slightly higher carbon than Grade A so the 275 MPa yield in ASME SA-203 can be met. Nickel stays in the same 2.25% nominal band. Tighter residuals or carbon equivalent limits are supplementary requirements.

SHH STEEL reports ladle analysis on every certificate. Product analysis is added when ASME SA-20 product analysis or the vessel specification requires it.

Tensile Requirements — ASME SA203 Grade B per ASME SA-203/SA-203M

These limits apply to SA203 Gr.B at both thin and thick sizes. Density is 7.85 g/cm³. Hardness after normalizing is typically around 160–180 HB unless a special window is ordered.

Compared with SA203 Grade A, Grade B gives 20 MPa more yield and a higher tensile band, with a small drop in minimum elongation. Specimens are prepared under ASME SA-20. If simulated PWHT is specified, coupons are heat-treated to the vessel cycle before testing.

Order SA203 Gr.B / SA203GRB when the ASME SA-203 drawing needs 2.25Ni and 275 MPa yield. If only 255 MPa is required, Grade A is enough. If the same 275 MPa yield is needed with 3.5Ni, use Grade E. Carbon QT options include ASME SA537 and ASTM A537. HSLA Steel Plates are not a coded substitute for ASME SA-203.

Nickel in SA203 Gr.B, specified by ASME SA-203/SA-203M, 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 Section VIII specifications set a colder temperature or a higher energy average.

SHH STEEL can supply SA203 Gr.B 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 B under ASME SA-203 is 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. Grade B carbon is slightly higher than Grade A, so hydrogen control should follow the qualified WPS. Preheat depends on thickness and restraint. When ASME Section VIII requires PWHT, the shop cycle is commonly 595–650°C. If properties after that cycle are needed, 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 B plates shall be normalized per ASME SA-203/SA-203M, 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 B unless the order is changed to Grade F.

If the specification fixes a normalizing temperature band or holding time per thickness under ASME SA-20, SHH STEEL writes those parameters into the mill instruction and reports them on the certificate.

SHH STEEL delivers ASME SA203 Grade B / SA203 Gr.B in the normalized condition as required by ASME SA-203.

The certificate lists SA203 Gr.B and, when dual certified, A203 Gr.B; 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 Section VIII 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.B 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 Section VIII specifications often add tests beyond the base SA-203 Grade B 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 per ASME SA-203 / SA-20.

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

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 B to ASME SA-203/SA-203M, or dual SA203 / A203 Grade B. Nearby carbon vessel grades include ASME SA516, ASTM A516, ASME SA515 and ASTM A285.

ASME SA203 Grade B / SA203 Gr.B is selected for ASME Section VIII vessels that need 2.25Ni toughness at 275 MPa yield. Typical applications of ASME SA203 Grade B Steel Plate include:

SHH STEEL supplies SA203 Gr.B 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 plates to ASME SA-203/SA-203M. For SA203 Grade B we offer:

• China mill-Direct Supply pricing on SA203 Gr.B / A203 Gr.B
• Dual ASME SA203 / ASTM A203 marking
• Heat analysis and product analysis per ASME SA-20 / SA-203
• 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 B from A/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 B Steel Plate is the 2.25% nickel, 275 MPa yield vessel grade in ASME SA-203/SA-203M. Whether the inquiry says SA203 Gr.B, SA203GRB, SA-203 Grade B 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 B / SA203 Gr.B 2.25Ni Vessel Plate with full traceability for ASME Section VIII fabrication.

Contact SHH STEEL today for stock, impact temperature, dual SA203/A203 marking to ASME SA-203, 3.2 inspection or a quotation.

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