ASTM A516 Grade 70 Pressure Vessel Steel Plate

What is ASTM A516 Grade 70 Pressure Vessel Steel Plate?

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ASTM A516 Grade 70 vessel plate is a medium carbon alloy with elements like manganese, phosphorus, sulfur in its chemical composition. A516 Grade 70 boiler plate is widely used in pressure vessel services where improved notch toughness is a major requirement. A516 Grade 70 boiler steel plate is used to make boilers and pressure vessels of higher standards and can be used in industries like petrochemical, oil and gas.

ASTM A516 Grade 70 pressure vessel steel plate is used for medium and low temperature services and can be customized to your specific requirements.

 

 

Parameter	Standard Range
Thickness	6 mm – 150 mm
Width	1,500 mm – 2,500 mm
Length	6,000 mm – 12,000 mm
Unit Weight	Up to ~20 tons per piece
Edge Condition	As-cut, sheared
Surface Condition	Mill finish, black

 

 

Element	Grade 55	Grade 60	Grade 65	Grade 70
Carbon, C	0.17 – 0.24	0.17 – 0.26	0.17 – 0.28	0.17 – 0.30
Manganese, Mn	0.85 – 1.20	0.85 – 1.20	0.85 – 1.20	0.85 – 1.20
Phosphorus, P	≤ 0.035	≤ 0.035	≤ 0.035	≤ 0.035
Sulfur, S	≤ 0.035	≤ 0.035	≤ 0.035	≤ 0.035
Silicon, Si	0.13 – 0.45	0.13 – 0.45	0.13 – 0.45	0.13 – 0.45
Copper, Cu (optional)	≤ 0.35	≤ 0.35	≤ 0.35	≤ 0.35
Nickel, Ni (optional)	≤ 0.40	≤ 0.40	≤ 0.40	≤ 0.40

 

 

Property	Grade 55	Grade 60	Grade 65	Grade 70
Tensile Strength	380-515 MPa | 55-75 ksi	415-550 MPa | 60-80 ksi	450-585 MPa | 65-85 ksi	485-620 MPa | 70-90 ksi
Yield Strength	205 MPa | 30 ksi	220 MPa | 32 ksi	240 MPa | 35 ksi	260 MPa | 38 ksi
Brinell Hardness	110-140 HB	120-150 HB	130-160 HB	135-170 HB
Rockwell Hardness	70-80 HRB	75-85 HRB	80-90 HRB	85-95 HRB
Vickers Hardness	120-160 HV	130-170 HV	140-180 HV	150-190 HV
Elongation	21%	21%	20%	18%
Elastic Modulus	210 GPa | 30,500 ksi	210 GPa | 30,500 ksi	210 GPa | 30,500 ksi	210 GPa | 30,500 ksi

 

Size in In.	Weight per Square Foot. in Lbs.
3/16 x 48	7.660
3/16 x 36	7.660
3/16 x 60	7.660
3/16 x 54	7.660
3/16 x 84	7.660
3/16 x 96	7.660
3/16 x 72	7.660
3/16 x 120	7.660
1/4 x 48	10.210
1/4 x 60	10.210
1/4 x 36	10.210
1/4 x 84	10.210
1/4 x 96	10.210
1/4 x 72	10.210

 

Heat Treatment and Delivery Conditions of ASTM A516 Gr.70 PVQ Plate

Normalizing Process

• Heating to approximately 870–920°C (1600–1690°F), above the upper critical temperature ($A_3$)
• Holding time based on plate thickness
• Air cooling to room temperature
• Produces a fine-grained ferrite-pearlite microstructure, thereby enhancing toughness

Post-Weld Heat Treatment (PWHT)

PWHT is commonly performed on fabricated pressure vessels to relieve residual welding stresses. Typical PWHT conditions for ASTM A516 Grade 70 steel include:

• Temperature: 595–650°C (1100–1200°F)
• Holding time: 1 hour per inch of thickness (minimum 1 hour)
• Slow cooling rate to prevent re-introducing thermal stresses
• Supplementary Requirement S3 specifies material qualification testing on simulated PWHT test coupons (SPWHT)

 

 

Standard A516 Grade 70 does not include hydrogen-induced cracking (HIC) resistance. However, HIC-resistant versions can be supplied to A516 specification with additional requirements. HIC-resistant plates are commonly used for wet H₂S (sour) service in oil & gas refining and production.

Parameter	Standard A516 Gr 70	HIC-Resistant A516 Gr 70
Phosphorus (max)	0.035%	≤ 0.010% (typical)
Sulfur (max)	0.035%	≤ 0.001% (typical)
Test Standard	Not required	NACE TM0284
CLR (avg, max)	-	5%
CTR (avg, max)	-	1.5%
CSR (avg, max)	-	0.5%
Delivery Condition	Rolled / Normalized	Normalized + Vacuum Degassed

 

 

Standard	Approximate Equivalent
EN 10028-2	P355GH
JIS G3115	SPV355 / SPV410
BS 1501	224-490 A / B
DIN 17155	HII / 19Mn6
GB 713	Q345R
IS 2041	R355 / R260
ISO 9328-2	P355GH

 

Why Choose GNEE Steel?

1. Export standard packaging: Moisture-proof kraft paper wrapping + reinforced steel frame pallet + seaworthy metal outer shell, avoiding rust and deformation during long sea transit to overseas construction yards
2. Each batch comes with an original manufacturer's material certificate (EN 10204 3.1) and a third-party testing report, ensuring full traceability of chemical composition and mechanical properties.
3. We maintain a stock of thousands of tons of steel, with same-day shipping for standard specifications. Small trial orders and samples are supported; minimum order quantities are not mandatory.

 

 

FAQ

Q: What is the difference between A516 Grade 70 and A515 Grade 70?

A515 Grade 70 is designed for higher-temperature service (typically above 400°F / 205°C) and has higher silicon content for elevated temperature strength. A516 Grade 70 is designed for moderate-to-lower temperature service with improved notch toughness. A516 Gr 70 is the more commonly specified grade for general pressure vessel applications where toughness is important.

 

Q: Does A516 Grade 70 require normalizing?

Normalizing is required for plates thicker than 38 mm (1.5 inches). For plates 38 mm and thinner, the as-rolled condition is acceptable per the standard, though normalized condition can be specified upon request. Many fabricators prefer normalized material for improved consistency and toughness regardless of thickness.

 

Q: What does the "N" suffix mean in SA516 Gr 70N?

The "N" suffix indicates the material is supplied in the normalized condition. While all plates over 38mm must be normalized, the N designation is often used to explicitly call out normalized condition regardless of thickness, and may imply additional normalized-state testing requirements.

 

Q: Is Q345R equivalent to A516 Grade 70?

Q345R (Chinese GB 713 standard) has similar tensile properties (yield ≥ 345 MPa, tensile 510–640 MPa) to A516 Grade 70, but there are differences in composition ranges, impact testing requirements, and certification. They are comparable but not direct equivalents. Substitution should be approved by the responsible engineer and code authority.

 

 

 

We guarantee the quality and quantity of A516 Grade 70 Pressure Vessel Steel. If you want to know more information, please contact us!

 

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