ASME SA542 Type A Class 2 Steel Plate | SA542 Type A Cl.2 QT Cr-Mo Vessel Plate

ASME SA542 Type A Class 2, also written ASME SA542 TYPE A CL.2, 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 A is the open 2.25Cr-1Mo line. Type B uses the same chromium-molybdenum idea with tighter carbon, phosphorus, sulfur, copper, nickel and vanadium. Class 2 is the highest tensile Class: 690 MPa yield and 795–930 MPa tensile. SHH STEEL is the supplier, exporter and distributor of this Type and Class. Plate is produced to ASME SA-542/SA-542M.

Buyers write ASME SA542 Type A Class 2, ASME SA542 TYPE A CL.2, SA542 Type A Class 2, SA542 Type A Cl.2, SA542A CL2, SA-542 Type A Class 2 and SA 542 Type A Cl 2. ASTM A542 Type A Class 2 is the companion product spec. A purchase order that only says “SA542 Type A” is incomplete. A purchase order that says “SA542 Grade 22 Class 2” is mixing this book with SA387 Grade 22.

This page is not SA832 22V. SA832 is normalized-and-tempered Cr-Mo-V. It is not SA517 Grade F. It is not SA537 Class 2. It is not SA516 Grade 70. Minimum thickness in the specification is about 5 mm. Maximum thickness is limited by the ability of the heat to meet Class 2 after quench and temper. Class 2 is the hardest tensile line to hold on thick plate. Confirm thickness before booking a slab.

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

This plate sits in pressure vessel steel plates and next to ASME SA387 plates, not as a substitute. It does not sit with carbon steel plates or ASTM A36 steel plate.

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

ASME SA542 Type A Class 2 / ASME SA542 TYPE A CL.2 uses Type A chemistry. Class only changes strength.

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

Type A 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, closer in idea to SA387 Grade 21. If the purchase order names Type B residual limits, do not ship Type A and call it close.

SHH STEEL reports heat analysis on every certificate, including Cr, Mo and Type A residuals.

Class 2 is the top line.

Tensile Requirements — ASME SA542 Type A Class 2

Class 1 is 585 MPa yield and 725–860 MPa tensile. Class 3 is 515 / 655–795. Class 4 is 380 / 585–760. Class 4a is 415 / 585–760. Do not stamp Class 1 as Class 2 because a coupon came in high. Do not quote Class 2 numbers on a thickness the mill cannot quench through.

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 690 MPa yield as permission to substitute A516 Gr.70, SA533 Type B Class 2 or HSLA steel plates.

SA299 Grade B, SA225 Grade D, SA455 steel plate and SA285 Grade C are also vessel plates. None of them is ASME SA542 TYPE A CL.2.

ASME SA542 Type A Class 2 / ASME SA542 TYPE A CL.2 is selected when the vessel wants quenched-and-tempered 2.25Cr-1Mo at the Class 2 strength line and accepts Type A residuals. Typical equipment is high-temperature welded pressure vessels and components written to SA-542 Type A Class 2. 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. It is not nickel low-temp plate like SA203 Grade B or SA203 Grade E. It is not layered QT carbon like SA724. It is not SA302 Grade C. Stainless inquiries belong on SA240 stainless plate or A240 stainless plate.

Do not form this plate as if it were as-rolled SA285 Grade A. Quench-and-temper properties are the product. A later PWHT cycle has to be planned and, when required, simulated on coupons.

SA542 Type A Cl.2 is killed, fine-grain 2.25Cr-1Mo at the highest Class. Welding is Code welding.

Qualify procedures to ASME Section IX. Use consumables written for 2.25Cr-1Mo QT at 795–930 MPa tensile, not a Class 1 procedure copied across and not an unreviewed SA387 Grade 12 procedure. Hydrogen control, preheat, interpass and PWHT follow the qualified procedure and the vessel specification.

The fabricator owns the WPS. SHH STEEL as supplier can share mill heat data for review.

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 uses 650 °C. Class 4a uses 675 °C. Do not apply the Class 4a floor to Class 2 and stamp 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 and not the SA537 Class 1 heat-treated carbon route. SHH STEEL as mill exporter prints QT, Type A, Class 2, austenitizing and tempering temperatures on the certificate when the mill record carries them.

Usual delivery from SHH STEEL as supplier and distributor is quenched-and-tempered ASME SA542 Type A Class 2 / ASME SA542 TYPE A CL.2 plate.

The certificate lists ASME SA542 Type A Class 2 and, when dual certified, ASTM A542 Type A Class 2; heat number; heat analysis including Cr, Mo and Type A residuals; product analysis when ordered; tensile results to the Class 2 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 for SA542 Type A Cl.2 QT Cr-Mo vessel plate:

• Thickness: commonly 8 mm – 100 mm, minimum about 5 mm. Class 2 through-thickness properties get harder as the plate thickens. Confirm the mill can hold 690 MPa yield at the ordered thickness
• 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 S355JR steel plate or JIS G3106 steel plate. Weathering plate belongs on S355J2W or Corten A steel. Fine-grain structural belongs on S355NL steel plate or S355ML steel plate. QT structural belongs on S690QL steel plate.

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.

Most export ASME SA542 Type A Class 2 / ASME SA542 TYPE A CL.2 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 St52-3, ASTM A516 plates, SA515 Grade 70 and A285 steel plate are not SA542 Type A Class 2.

Ship plate inquiries belong on shipbuilding steel plates or BV ship plate. Weathering inquiries belong on weathering steel plates. Stainless inquiries belong on stainless steel plates, SUS304 steel or AISI 304 plate.

Other vessel comparisons: SA203 Grade D, SA302 Grade A, A516 Grade 70, SA533 Type C Class 2, SA517 Grade P, SA387 Grade 11.

ASME SA542 Type A Class 2 / ASME SA542 TYPE A CL.2 that means mill pricing, dual SA542/A542 marking, Type A chemistry, recorded quench and temper at the Class 2 floor, tensile results at 690 MPa yield and 795–930 MPa tensile, 3.1 as standard and 3.2 when specified.

We keep Type and Class on the order. Type A is not Type B and is not Type D. Class 2 is not Class 1 and is not Class 4a. SA542 is not SA387 Grade 22. SA542 is not SA516 Grade 55. SA542 Type A Cl.2 is not SA533 Type C Class 1. If the drawing names Type B residuals, we will not ship Type A and call it close. If the thickness cannot hold Class 2, we will say so before rolling.

Company scope: China steel Mill Agent-SHH STEEL.

ASME SA542 Type A Class 2 Steel Plate, also searched as ASME SA542 TYPE A CL.2, is quenched-and-tempered 2.25Cr-1Mo plate under ASME SA-542/SA-542M, with Type A residuals and Class 2 strength. Whether the inquiry says ASME SA542 Type A Class 2, ASME SA542 TYPE A CL.2, SA542 Type A Cl.2 or SA542A CL2, SHH STEEL as supplier, exporter, distributor and stockist supplies plate with Type A chemistry, recorded QT delivery, 690 MPa yield, and EN 10204 3.1 or 3.2 certification.

SHH STEEL is the China mill vendor of ASME SA542 Type A Class 2 / ASME SA542 TYPE A CL.2 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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