A516 Grade 70 for Heat Exchanger Steel Plate

ASTM A516 Grade 70 is a carbon steel plate, commonly used in pressure vessel and boiler fabrication, known for its strength, weldability, and notch toughness. It's a popular choice for applications in power generation, oil and gas, and chemical plants due to its reliability and versatility.

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Product Description

1.What are the chemical composition of A516 Grade 70 for Heat Exchanger Steel Plate?

A516 Grade 70 Chemical Composition
Grade	The Element Max (%)
Grade	C	Si	Mn	P	S
A516 grade 70	0.27-0.31	0.13-0.45	0.79-1.30	0.035	0.035

2.What is the difference between A515 GR 70 and A516 GR 70?

Standard Purpose

A515 Grade 70: Used for pressure vessels in medium-to-high temperature environments(e.g., boilers, steam storage tanks), typically with non-corrosive or weakly corrosive media
A516 Grade 70: Designed for low-to-medium temperature environments, especially for pressure vessels with corrosive media(e.g., sulfur-containing crude oil, acidic gases), emphasizing resistance to hydrogen-induced cracking (HIC) and sulfide stress corrosion (SSC).

Typical Applications

A515 Grade 70: Power plant boiler drums, non-corrosive media storage tanks, heat exchanger shells.
A516 Grade 70: Refinery hydroprocessing units, natural gas treatment equipment, sulfur-containing crude oil storage vessels.

Core Design Objective

A515 Grade 70: Medium-to-high temperature strength stability
A516 Grade 70: Crack resistance (HIC/SSC) + toughness in corrosive environments

Media Compatibility

A515 Grade 70: Non-corrosive/weakly corrosive media (e.g., clean water, steam)
A516 Grade 70: Corrosive media (e.g., H₂S/CO₂-containing oil and gas)

Temperature Range

A515 Grade 70: Higher temperature (≤427°C)
A516 Grade 70: Broader temperature range (low-to-medium temperature, ≤343°C)

Cost

A515 Grade 70: Lower (relaxed compositional requirements)
A516 Grade 70: Higher (strict impurity control, requires additional impact testing)

3.What is A516 GR 70 steel equivalent to?

Country/Standard	Equivalent Material Grade	Key Characteristics
ASME (USA)	SA-516 Grade 70	Same as ASTM A516 Grade 70; intended for welded pressure vessels requiring notch toughness.
GB (China)	Q345R	Low-alloy high-strength structural steel for pressure vessels; similar tensile strength (≥490 MPa) but with slight compositional differences (e.g., Mn content).
EN (Europe)	P355GH	European standard steel for pressure purposes; meets EN 10028-2. Tensile strength: 510–680 MPa (close to A516 Grade 70’s 485–625 MPa).
JIS (Japan)	SB410	Carbon steel for pressure vessels (JIS G3115); tensile strength: 410–550 MPa (slightly lower than A516 Grade 70).
DIN (Germany)	HII (old standard)	Traditional carbon steel for boilers and pressure vessels; comparable to modern P265GH but with less strict toughness requirements.
ISO (International)	ISO 9328-2 Grade P355GH	Aligns with EN P355GH; specifies requirements for flat products of weldable fine-grain steels for pressure purposes.
BS (UK)	15Mo3 (old standard)	Low-alloy steel with molybdenum for improved creep resistance at moderate temperatures; not an exact match but used in similar applications.