ASME SA542 Type B Class 3 Steel Plate | SA542 Type B Cl.3 QT Cr-Mo Vessel Plate

ASME SA542 Type B Class 3, also written ASME SA542 TYPE B CL.3, is quenched-and-tempered 2.25Cr-1Mo alloy plate under ASME SA-542/SA-542M. The specification covers Type A, B, C, D and E, and Class 1, 2, 3, 4 and 4a. Type B is the same 2.25Cr-1Mo idea as Type A, with tighter limits on carbon, phosphorus, sulfur, copper, nickel and vanadium. Class 3 sits between the high Classes and the Class 4 / 4a band: 515 MPa yield and 655–795 MPa tensile. SHH STEEL is a China mill supplier, exporter, distributor and stockist of this grade. Plate is produced to ASME SA-542/SA-542M.

Buyers write ASME SA542 Type B Class 3, ASME SA542 TYPE B CL.3, SA542 Type B Class 3, SA542 Type B Cl.3, SA542B CL3, SA-542 Type B Class 3 and SA 542 Type B Cl 3. ASTM A542 Type B Class 3 is the companion product spec. A purchase order that only says “SA542 Type B” is incomplete. A purchase order that says “SA542 Grade 22 Class 3” is mixing this book with SA387 Gr.22 Cl.2.

This page is not SA832 22V. SA832 is normalized-and-tempered Cr-Mo-V. SA542 Type B Class 3 is QT 2.25Cr-1Mo without the 22V vanadium band. It is not SA517 Gr.E. It is not SA841 TMCP. It is not ASME SA516 carbon plate. Minimum thickness in the specification is about 5 mm. Maximum thickness is limited by the ability of the heat to meet Class 3 after quench and temper.

For Type A, B and C in Class 1, 2 and 3, the minimum tempering temperature is 565 °C. Dual marking SA542 / A542 Type B Class 3 is available from SHH STEEL as mill supplier and exporter. Certificates can be EN 10204 3.1 or 3.2. Company scope: China steel Mill Agent-SHH STEEL.

This plate sits in the pressure vessel steel plates family and with ASME SA387 as a related Cr-Mo family, not as a substitute. It does not sit with carbon steel plates or ASTM A36/A36M.

SA-20 still governs marking, testing location, retests and repair rules.

ASME SA542 Type B Class 3 / ASME SA542 TYPE B CL.3 uses Type B chemistry. Class only changes strength. SHH STEEL, as supplier and mill distributor, reports the ladle against Type B, not Type A.

Heat Analysis and Product Analysis — ASME SA542 Type B (typical Table 1 limits)

Type B is not Type D. Type D adds a vanadium band of about 0.25–0.35% and is 2.25Cr-1Mo-V. Type C and Type E sit on the 3Cr-1Mo-V band. If the ladle is 2.25Cr-1Mo-V, SHH STEEL will not ship it as Type B Class 3.

Class 3 is the mid QT line.

Tensile Requirements — ASME SA542 Type B Class 3

Class 1 is 585 MPa yield and 725–860 MPa tensile. Class 2 is 690 MPa yield and 795–930 MPa tensile. Class 4 / 4a share 585–760 MPa tensile. Do not stamp Class 3 as Class 1 because a coupon came in high.

Density is 7.85 g/cm³. Notch toughness is commonly added. Write the temperature, energy, location and orientation. Simulated PWHT is common.

Do not treat 515 MPa yield as permission to substitute SA516 Gr.70, SA533 Type A Class 1 or high strength low alloy plates.

SA299 Gr.A, SA225 Gr.C, SA455 and SA285 Gr.C are also vessel plates. None of them is ASME SA542 TYPE B CL.3.

ASME SA542 Type B Class 3 / ASME SA542 TYPE B CL.3 is selected when the vessel wants quenched-and-tempered 2.25Cr-1Mo at the Class 3 strength line, with Type B residual control. Typical equipment is high-temperature welded pressure vessels and components written to SA-542 Type B Class 3. Allowable stress comes from ASME Section II Part D after the Code lists this Type and Class.

SHH STEEL supplies this plate as exporter and stockist for shops that need Class 3 instead of Class 1 or Class 4a. It is not nickel low-temp plate like SA203 Gr.A. It is not layered QT carbon like SA724. Stainless inquiries belong on ASME SA240/SA240M, ASTM A240/A240M or stainless steel sheets and plates.

Do not form this plate as if it were as-rolled carbon. Quench-and-temper properties are the product. A later PWHT cycle has to be planned and, when required, simulated on coupons.

SA542 Type B Cl.3 is killed, fine-grain 2.25Cr-1Mo at Class 3 strength. Welding is Code welding.

Qualify procedures to ASME Section IX. Use consumables written for 2.25Cr-1Mo QT at 655–795 MPa tensile, not a Class 2 procedure copied down and not an unreviewed SA387 Grade 22 procedure. Hydrogen control, preheat, interpass and PWHT follow the qualified procedure and the vessel specification.

Do not copy a SA387 Gr.12 Cl.1 procedure onto Type B Class 3 without review. The fabricator owns the WPS. SHH STEEL as supplier can share mill heat data for WPS review; the shop still owns the qualification.

Plates shall be austenitized, quenched in a suitable liquid medium, then tempered. For Type A, B and C in Class 1, 2 and 3, the minimum tempering temperature is 565 °C (1050 °F). Soak is not less than 1.2 min/mm of thickness and not less than ½ hour. Class 4 and Class 4a use higher temper floors. Do not apply the Class 4a floor of 675 °C to Class 3 and call the plate Class 4a.

If the vessel will see a long PWHT, test coupons shall follow a simulated cycle. This is not the SA832 N+T route. SHH STEEL as mill exporter prints QT, Type B, Class 3, austenitizing and tempering temperatures on the certificate when the mill record carries them.

Usual delivery from SHH STEEL as supplier and stockist is quenched-and-tempered ASME SA542 Type B Class 3 / ASME SA542 TYPE B CL.3 plate.

The certificate lists ASME SA542 Type B Class 3 and, when dual certified, ASTM A542 Type B Class 3; heat number; heat analysis including Cr, Mo and Type B residuals; product analysis when ordered; tensile results to the Class 3 table; QT statement; impact and simulated PWHT when ordered. Certificates may be EN 10204 3.1 or EN 10204 3.2.

Usual supply range from SHH STEEL as distributor and exporter for SA542 Type B Cl.3 QT Cr-Mo vessel plate:

• Thickness: commonly 8 mm – 150 mm, minimum about 5 mm, limited by the ability of the heat to meet Class 3 after QT
• Width: 1500 mm – 4000 mm
• Length: 3000 mm – 12000 mm
• Cut-to-length shells, heads and nest sizes inside those limits

Structural sizes belong on EN 10025-2 or JIS G3106. Weathering plate belongs on EN 10025-5 or Corten A/B. Fine-grain structural belongs on EN 10025-3 or EN 10025-4. QT structural belongs on EN 10025-6.

Dimensional limits follow ASME SA-20. Thickness, width, length, flatness and camber are vessel-plate tolerances. UT to A435 / A577 / A578 is commonly added on reactor plate supplied by SHH STEEL.

Most export ASME SA542 Type B Class 3 / ASME SA542 TYPE B CL.3 orders add extras. SHH STEEL as supplier does not assume them.

Charpy details. Temperature, energy, location and orientation.

Simulated PWHT. Same-heat coupons follow the vessel cycle.

NDE. UT to A435 / A577 / A578.

Hydrogen-service extras. When the vessel specification names them.

Third-party. EN 10204 3.2.

DIN 17100, ASTM A516, ASME SA515 and ASTM A285 are not SA542 Type B Class 3.

Ship plate inquiries belong on shipbuilding steel plates or BV Rules. Weathering inquiries belong on weathering steel plates. Stainless inquiries belong on stainless steel products, JIS G4305 or AISI stainless.

Other vessel comparisons: SA203 Gr.B, SA302 Gr.A, A516 Gr.70, SA533 Type C Class 1, SA517 Gr.P.

SHH STEEL is the supplier, exporter, distributor, stockist and China mill vendor of ASME SA-542/SA-542M plate. On ASME SA542 Type B Class 3 / ASME SA542 TYPE B CL.3 that means mill pricing, dual SA542/A542 marking, Type B chemistry, recorded quench and temper at the Class 3 floor, tensile results at 515 MPa yield and 655–795 MPa tensile, 3.1 as standard and 3.2 when specified.

We keep Type and Class on the order. Type B is not Type A and is not Type D. Class 3 is not Class 1 and is not Class 4a. SA542 is not SA387 Grade 22. SA542 is not SA516 Gr.55. SA542 Type B Cl.3 is not SA533 Type C Class 1. If the drawing names N+T Cr-Mo-V, we point the inquiry to SA832. If the shop plans as-rolled delivery, we will say this specification is QT.

Company scope: China steel Mill Agent-SHH STEEL.

ASME SA542 Type B Class 3 Steel Plate, also searched as ASME SA542 TYPE B CL.3, is quenched-and-tempered 2.25Cr-1Mo plate under ASME SA-542/SA-542M, with Type B residual control and Class 3 strength. Whether the inquiry says ASME SA542 Type B Class 3, ASME SA542 TYPE B CL.3, SA542 Type B Cl.3 or SA542B CL3, SHH STEEL as supplier, exporter, distributor and stockist supplies plate with Type B chemistry, recorded QT delivery, 515 MPa yield, and EN 10204 3.1 or 3.2 certification.

SHH STEEL is the China mill vendor of ASME SA542 Type B Class 3 / ASME SA542 TYPE B CL.3 QT Cr-Mo Vessel Plate for ASME Section VIII work that actually names this Type and Class.

Contact SHH STEEL for mill rolling, stock inquiry, dual SA542/A542 marking, simulated PWHT testing, 3.2 inspection or a quotation.

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