ASTM A662 Gr.B Introduction
ASTM A662 Gr.B is a carbon-manganese-silicon (C-Mn-Si) steel plate engineered specifically for boiler and pressure vessel applications operating in moderate- to lower-temperature service. It represents the most widely specified grade in the A662 specification family, and for good reason.
Gr.B occupies the optimal balance point in the A662 strength hierarchy: specifying a minimum yield strength of 275 MPa (40 ksi) and a tensile strength range of 450–585 MPa (65–85 ksi). Compared to Grade A, it delivers an increase in upper-bound tensile strength of approximately 50 MPa without sacrificing ductility. This higher load-bearing capacity per unit weight of steel makes Grade B an engineering workhorse for fabricating boiler drums, pressure vessels, and process equipment across various industrial sectors.
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ASTM A662 Gr.B Boiler & Pressure Vessel Steel Plate Specification
| Parameter | Range |
|---|---|
| Thickness | 6 mm – 300 mm |
| Width | 1,500 mm – 4,050 mm |
| Length | 3,000 mm – 15,000 mm |
| Processing | Cutting, beveling, drilling, welding, shot blasting, painting |
| Certification | EN 10204 3.1 / 3.2 |
| Third-Party Inspection | SGS, BV, Lloyd's Register, TUV |
ASTM A662 Gr.B Pressure Vessel Steel Plate Chemical property
| Grade | C | Mn | Si | P | S |
| ASTM A662 Gr.B | 0.22max | 0.13-0.45 | 0.79-1.62 | 0.035max | 0.035max |
ASTM A662 Gr.B Boiler Steel Plate mechanical property
|
Grade |
ASTM A662 Gr.BMechanical Property |
|||
|
Thickness |
Yield |
Tensile |
Elongation |
|
|
ASTM A662 Gr.B |
mm |
Min Mpa |
Mpa |
Min % |
|
200 |
275 |
450-585 |
20 |
|
|
50 |
23 |
|||
Charpy V-notch impact testing is conducted at -20°C / -40°C / -60°C to verify low-temperature notch toughness.
ASTM A662 Gr.B Equivalent Grades
| Standard | Grade |
|---|---|
| ASTM A662 / ASME SA-662 | Grade B |
| EN 10028 | P295GH |
| ISO | P290 |
ASTM A662 Steel Plate Delivery Conditions and Non-Destructive Testing (NDT)
Delivery Condition: All Gr.A plates, as well as Gr.B and Gr.C plates exceeding 40 mm (1.5 in.) in thickness, shall be supplied in the normalized condition. Gr.B and Gr.C plates 40 mm (1.5 in.) and under in thickness are typically supplied in the as-rolled condition, but may also be ordered as normalized, stress relieved, or normalized and stress relieved.
Ultrasonic Testing (UT): ASTM A662 Gr.B plates can be subjected to ultrasonic inspection per ASTM A578/A578M. Ultrasonic testing to ASTM A578/A578M evaluates internal soundness and identifies potential volumetric discontinuities or internal flaws within the plate.
ASTM A662 Gr.B Steel Plate Manufacturing Process
The manufacturing route for ASTM A662 Gr.B steel plates encompasses electric arc furnace (EAF) steelmaking, ladle refining (LF) and vacuum degassing (VD), ingot casting/continuous casting, slab preparation, reheating, plate rolling, ultrasonic testing, normalizing heat treatment, finishing, final inspection, and warehousing. The steelmaking practice must conform to the fine austenitic grain size requirements stipulated in ASTM A20/A20M.
ASTM A662 Gr.B Plate Key Applications
ASTM A662 Gr.B steel plates are extensively specified across the oil and gas, petrochemical, power generation, and boiler manufacturing industries. Typical equipment and components include:
- Chemical and petrochemical reactors
- Heat exchangers and separators
- Spherical storage tanks, oil/gas vessels, and LPG tanks
- Nuclear reactor pressure vessels
- Boiler drums and LPG cylinders
- Penstocks and turbine scroll cases for hydroelectric power stations
What GNEE Can Provide for ASTM A662 Gr.B?
GNEE supplies ASTM A662 Gr.B boiler & pressure vessel plates with full certification, industry-specific testing, and global delivery to 100+ countries.
Large Stock & Fast Delivery
Stock items ship in 7 days; mill rolling for custom sizes in 30–50 days.
Third-Party Inspection
SGS, Bureau Veritas, Lloyd's Register, TUV - coordinated per your project.
Value-Added Processing
Cutting to size, beveling, drilling, welding prep, shot blasting, painting.
Global Export
Competitive FOB/CIF pricing, seaworthy packaging, shipping from Shanghai, Tianjin, and Qingdao.
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FAQ
What are the material characteristics of ASTM A662 Gr.B?
ASTM A662 Gr.B is a carbon-manganese-silicon steel plate material designed for welded pressure vessels and boilers operating at moderate and low temperatures.
What is the yield strength of ASTM A662 Gr.A, B, and C?
The minimum yield strength is 275 MPa (40 ksi) for Gr.A, 275 MPa (40 ksi) for Gr.B, and 295 MPa (43 ksi) for Gr.C.
Is ASTM A662 Grade B suitable for low-temperature pressure vessels?
Yes, ASTM A662 Gr.B is specifically designed and suitable for moderate and lower-temperature welded pressure vessels.
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