ASME SA542 Type D Class 4a Steel Plate | SA542 Type D Cl.4a QT Cr-Mo-V Vessel Plate
What is ASME SA542 Type D Class 4a Steel?
ASME SA542 Type D Class 4a, also written ASME SA542 TYPE D CL.4A, is quenched-and-tempered chromium-molybdenum-vanadium alloy plate under ASME SA-542/SA-542M. Type D is the 2.25Cr-1Mo-V line. Chromium heat is 2.00–2.50%. Molybdenum heat is 0.90–1.10%. Vanadium heat is 0.25–0.35%. That is the QT partner of SA832 Grade 22V, not the 3Cr Type C / Type E line. Class 4a is 415 MPa yield and 585–760 MPa tensile, with 18% elongation. Temper floor for Class 4a is 675 °C. Minimum austenitizing temperature for Type D is 900 °C. 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 D Class 4a, ASME SA542 TYPE D CL.4A, SA542 Type D Class 4a, SA542 Type D Cl.4a, SA542D CL4A, SA-542 Type D Class 4a and SA 542 Type D Cl 4a. ASTM A542 Type D Class 4a is the companion product spec. A purchase order that only says “SA542 Type D” is incomplete. Type D is listed most clearly as Class 4a. Do not invent Type D Class 1 or Class 2 without checking the edition.
This page is not Type A or Type B. Those are 2.25Cr-1Mo without the Type D vanadium band. It is not Type C or Type E, which sit on 2.75–3.25% chromium. It is not SA387 Gr.22 Cl.2. It is not SA832 22V; that book is normalized-and-tempered. It is not SA517 Gr.B. It is not SA516 Gr.70. Minimum thickness in the specification is about 5 mm. Maximum thickness is limited by the ability of the heat to meet Class 4a after quench and temper.
Dual marking SA542 / A542 Type D Class 4a 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.
Material Specification
| Specification Element | Requirement | SHH STEEL Compliance |
|---|---|---|
| Type / Class | ASME SA542 Type D Class 4a | Confirmed |
| Product Specification | ASME SA-542/SA-542M | Applied |
| Companion Spec | ASTM A542 Type D Class 4a | Dual cert available |
| General Requirements | ASME SA-20 / ASTM A20 | Applied |
| Process | Quenched and tempered | Confirmed |
| Austenitize floor | 900 °C min for Type D | Applied |
| Class 4a temper floor | 675 °C min | Applied |
| Alloy idea | 2.25Cr-1Mo-V | Confirmed |
| Sister N+T spec | SA-832 Grade 22V | Not this page |
| Supply role | Supplier / exporter / distributor | SHH STEEL |
| Certification | EN 10204 3.1 or 3.2 / third-party | As ordered |
This plate sits in pressure vessel steel plates and next to the ASME SA387 family, 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.
Chemical Composition
ASME SA542 Type D Class 4a / ASME SA542 TYPE D CL.4A uses Type D chemistry. Class only changes strength and temper floor.
Heat Analysis and Product Analysis — ASME SA542 Type D (typical Table 1 limits)
| Element | Heat Analysis (%) | Product Analysis (%) |
|---|---|---|
| Carbon (C) | 0.11 – 0.15 | 0.09 – 0.18 |
| Manganese (Mn) | 0.30 – 0.60 | 0.25 – 0.66 |
| Phosphorus (P), max | 0.020 | 0.020 |
| Sulfur (S), max | 0.015 | 0.015 |
| Silicon (Si), max | 0.10 | 0.13 |
| Chromium (Cr) | 2.00 – 2.50 | 1.88 – 2.62 |
| Molybdenum (Mo) | 0.90 – 1.10 | 0.85 – 1.15 |
| Vanadium (V) | 0.25 – 0.35 | 0.23 – 0.37 |
| Titanium, boron, niobium, copper, nickel, calcium | As Table 1 of the named edition | As Table 1 of the named edition |
Type D vanadium sits higher than Type C (0.25–0.35% vs 0.20–0.30%). Chromium at 2.75–3.25% is Type C or Type E, not Type D. If V is missing, the plate is Type A or Type B, not Type D.
SHH STEEL reports heat analysis on every certificate, including Cr, Mo and V.
Mechanical Properties
Class 4a is the listed Type D strength line.
Tensile Requirements — ASME SA542 Type D Class 4a
| Property | Requirement |
|---|---|
| Yield strength, min | 415 MPa (60 ksi) |
| Tensile strength | 585 – 760 MPa (85 – 110 ksi) |
| Elongation in 50 mm, min | 18% |
| Density | 7.85 g/cm³ |
| Hardness | Not a default substitute for tensile |
Class 4 on Type A / B / C is 380 MPa yield at the same tensile band. Type D is written as Class 4a. Do not stamp Type D as Type A Class 4a because tensile matches.
Density is 7.85 g/cm³. Notch toughness is commonly added. Write the temperature, energy, location and orientation. Simulated PWHT is common on hydroprocessing work.
Do not treat 415 MPa yield as a free swap with A516 Grade 70, SA533 Type A Cl.1 or high strength low alloy plates.
Material Comparison
| Grade | Route | Alloy / strength idea | Swap? |
|---|---|---|---|
| SA542 Type A / B Class 4a | QT 2.25Cr-1Mo | No Type D vanadium band | No |
| SA542 Type D Cl.4a | QT 2.25Cr-1Mo-V | 415 / 585–760, N ≥ 900 °C | This page |
| SA542 Type C Class 4a | QT 3Cr-1Mo-V | Higher chromium | No |
| SA542 Type E Class 4a | QT 3Cr-1Mo-V | Type E, N ≥ 1010 °C | No |
| SA387 Gr.22 Cl.2 | Cr-Mo family | 2.25Cr-1Mo, no Type D V band | No |
| SA832 22V | N+T 2.25Cr-1Mo-V | Sister chemistry, not QT | No |
SA299 Gr.B, SA225 Gr.D, SA455 steel plate and SA285 Gr.C are also vessel plates. None of them is ASME SA542 TYPE D CL.4A.
QT Cr-Mo-V Vessel Service
ASME SA542 Type D Class 4a / ASME SA542 TYPE D CL.4A is selected when the vessel wants quenched-and-tempered 2.25Cr-1Mo-V at the Class 4a line. Typical equipment is high-temperature welded pressure vessels and hydroprocessing components written to SA-542 Type D Class 4a. 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 Gr.D or SA203 Gr.E. It is not layered QT carbon like SA724. It is not SA302 Gr.C. Stainless inquiries belong on ASME SA240 or ASTM A240.
Do not form this plate as if it were as-rolled SA285 Gr.A. Quench-and-temper properties are the product. A later PWHT cycle has to be planned and, when required, simulated on coupons.
Weldability
SA542 Type D Cl.4a is killed, fine-grain 2.25Cr-1Mo-V at Class 4a strength. Welding is Code welding.
Qualify procedures to ASME Section IX. Use consumables written for 2.25Cr-1Mo-V QT at 585–760 MPa tensile, not a Type A procedure copied across and not an unreviewed SA387 Gr.12 Cl.2 procedure. Vanadium belongs in the WPS review. 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.
Heat Treatment
Plates shall be austenitized, quenched in a suitable liquid medium, then tempered. For Type D the minimum austenitizing temperature is 900 °C (1650 °F). For Class 4a the minimum tempering temperature is 675 °C (1250 °F). Soak is not less than 1.2 min/mm of thickness and not less than ½ hour. Type E uses 1010 °C. Type A / B Class 1–3 use a 565 °C temper floor. Do not run Type D as if it were Type A Class 4a without the vanadium heat and the 900 °C floor.
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 Cl.1 heat-treated carbon route. SHH STEEL as mill exporter prints QT, Type D, Class 4a, austenitizing and tempering temperatures on the certificate when the mill record carries them.
Delivery Condition
Usual delivery from SHH STEEL as supplier and distributor is quenched-and-tempered ASME SA542 Type D Class 4a / ASME SA542 TYPE D CL.4A plate.
The certificate lists ASME SA542 Type D Class 4a and, when dual certified, ASTM A542 Type D Class 4a; heat number; heat analysis including Cr, Mo and V; product analysis when ordered; tensile results to the Class 4a table; QT statement with the 900 °C / 675 °C floors; impact and simulated PWHT when ordered. Certificates may be EN 10204 3.1 or EN 10204 3.2.
Dimensions
Usual supply range from SHH STEEL for SA542 Type D Cl.4a QT Cr-Mo-V vessel plate:
- Thickness: commonly 8 mm – 150 mm, minimum about 5 mm, limited by the ability of the heat to meet Class 4a 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.
Tolerances
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.
Supplementary Requirements
Most export ASME SA542 Type D Class 4a / ASME SA542 TYPE D CL.4A 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.
Equivalent Material Grades
These names are project-comparison grades. They are not automatic substitutes.
| Designation | Standard / region | Notes |
|---|---|---|
| ASME SA542 Type D Class 4a / ASME SA542 TYPE D CL.4A | ASME SA-542/SA-542M | Code name on this page |
| ASTM A542 Type D Class 4a | ASTM A542/A542M | Companion US product spec |
| SA542 Type A / B Class 4a | ASME SA-542 | 2.25Cr-1Mo, no Type D V band |
| SA542 Type C / E Class 4a | ASME SA-542 | 3Cr-1Mo-V |
| SA387 Gr.22 Cl.2 | ASME SA-387 | 2.25Cr-1Mo, not QT Type D |
| ASTM A387 Grade 22 Class 2 | ASTM A387 | Same caution |
| SA832 Grade 22V | ASME SA-832 | N+T sister chemistry |
| 10CrMo9-10 / 12CrMo9-10 | EN 10028-2 / DIN | 2.25Cr-1Mo family, usually no V band |
| 13CrMo4-5 | EN 10028-2 | 1.25Cr-0.5Mo |
| 13CrMoV42 related | DIN / older German | Cr-Mo-V comparison |
| SCMV4 | JIS G4109 | 2.25Cr-1Mo vessel |
| SCMV4V / 2.25Cr-1Mo-V related | JIS project specs | Confirm V and QT |
| 12Cr2Mo1R | GB/T 713 | 2.25Cr-1Mo Chinese vessel plate |
| 12Cr2Mo1VR | GB/T 713 / project specs | 2.25Cr-1Mo-V comparison |
| 15CrMoR | GB/T 713 | 1.25Cr-0.5Mo |
| 2.25Cr-1Mo-0.25V | API / hydroprocessing practice | Process name, confirm Code stamp |
| ASME SA387 | SA-387 family | Related Cr-Mo, not this QT Class |
DIN 17100, ASTM A516, ASME SA515 and ASTM A285 are not SA542 Type D Class 4a.
Applications
| Industry | Typical components |
|---|---|
| High-temperature vessels | ASME SA542 Type D Class 4a shells and ASME SA542 TYPE D CL.4A heads |
| Hydroprocessing / 2.25Cr-1Mo-V QT equipment | SA542 Type D Cl.4a courses |
| Dual-certified export | SA542 / A542 Type D Class 4a plate from SHH STEEL |
| Fabrication | SA542 Type D Cl.4a cut to nest sizes |
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 Grade 70, SA533 Type C Cl.2, SA517 Gr.P, SA387 Gr.11 Cl.2.
Why Choose SHH STEEL
SHH STEEL is the supplier, exporter, distributor and stockist of ASME SA-542/SA-542M plate. On ASME SA542 Type D Class 4a / ASME SA542 TYPE D CL.4A that means mill pricing, dual SA542/A542 marking, Type D chemistry with Cr-Mo-V reported, recorded quench from not less than 900 °C and temper at not less than 675 °C, tensile results at 415 MPa yield and 585–760 MPa tensile, 3.1 as standard and 3.2 when specified.
We keep Type and Class on the order. Type D is not Type A, Type B, Type C or Type E. Class 4a is the Type D line. SA542 Type D is not SA387 Gr.22 Cl.2. SA542 is not SA516 Gr.55. SA542 Type D Cl.4a is not SA533 Type C Cl.1. If the drawing names N+T 2.25Cr-1Mo-V, we point the inquiry to SA832 22V. If the drawing names 3Cr-1Mo-V QT, we point it to Type C or Type E.
Company scope: China steel Mill Agent-SHH STEEL.
FAQ
- What names are used for ASME SA542 Type D Class 4a / ASME SA542 TYPE D CL.4A?What names are used for ASME SA542 Type D Class 4a / ASME SA542 TYPE D CL.4A?
- Is ASME SA542 Type D Class 4a the same as ASTM A542 Type D Class 4a?Chemistry and tensile limits match. ASME SA-542 is the Code version. ASTM A542 is the product spec. As exporter and mill distributor, SHH STEEL dual-certifies both names when the vessel must be stamped.
- What is the yield strength of SA542 Type D Cl.4a?415 MPa minimum. Tensile is 585–760 MPa. Elongation is 18% in 50 mm.
- How is ASME SA542 TYPE D CL.4A different from Type A Class 4a?Same Class 4a tensile table. Type D is 2.25Cr-1Mo-V with V 0.25–0.35% and a 900 °C austenitize floor. Type A is 2.25Cr-1Mo without that vanadium band.
- How is ASME SA542 Type D Class 4a different from Type C Class 4a?Type D chromium is 2.00–2.50%. Type C chromium is 2.75–3.25%. Type D vanadium is 0.25–0.35%. Type C vanadium is 0.20–0.30%.
- Is SA542 Type D Class 4a the same as SA832 22V or SA387 Grade 22?No. SA832 22V is N+T 2.25Cr-1Mo-V. SA387 Grade 22 is 2.25Cr-1Mo in the SA387 family. SA542 Type D Class 4a is QT 2.25Cr-1Mo-V at Class 4a strength.
- ho supplies ASME SA542 Type D Class 4a?HH STEEL is the supplier, exporter, distributor and stockist.
- Can welding of SA542 Type D Cl.4a be qualified to ASME Section IX?Yes. Use a WPS written for QT 2.25Cr-1Mo-V at Class 4a strength. The fabricator owns the procedure.
- Can SHH STEEL issue EN 10204 3.2 for ASME SA542 Type D Class 4a?Yes. EN 10204 3.1 is standard. EN 10204 3.2 is arranged when written on the order.
Conclusion
ASME SA542 Type D Class 4a Steel Plate, also searched as ASME SA542 TYPE D CL.4A, is quenched-and-tempered 2.25Cr-1Mo-V plate under ASME SA-542/SA-542M, with 415 MPa yield, a 900 °C austenitize floor and a 675 °C temper floor. Whether the inquiry says ASME SA542 Type D Class 4a, ASME SA542 TYPE D CL.4A, SA542 Type D Cl.4a or SA542D CL4A, SHH STEEL as supplier, exporter, distributor and stockist supplies plate with Type D chemistry, recorded QT delivery, and EN 10204 3.1 or 3.2 certification.
SHH STEEL is the China mill vendor of ASME SA542 Type D Class 4a / ASME SA542 TYPE D CL.4A QT Cr-Mo-V 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.
ASME SA542 Type D Class 4a Steel Plate, ASME SA542 TYPE D CL.4A, SA542 Type D Cl.4a, SA542D CL4A, SA-542 Type D Class 4a, QT Cr-Mo-V vessel plate, SHH STEEL supplier exporter distributor stockist
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