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ASTM A516 Grade 70(A516GR70) Boiler and Pressure Vessel Steel Plate

Q: Does A516Gr70 steel plate require post-weld heat treatment?

Thickness ≤50 mm: Not mandatory, but recommended for critical welds.Thickness >50 mm or for use in hydrogen sulphide or wet corrosion environments: Post-weld heat treatment is mandatory to eliminate residual welding stresses and prevent hydrogen-induced cracking.

Q: What is the applicable temperature range for ASTM A516 Grade 70 boiler and pressure vessel steel plates?

Standard Safe Temperature Range: -29°C to 343°CThis is the range recommended for long-term stable operation in engineering design. Within this temperature range, the mechanical properties of the material (such as strength and toughness) can be reliably guaranteed.Extreme Temperature Limits: -46°C to 538°CLower Temperature Limit (-46°C): By using steel plates supplied in the normalised condition (commonly referred to as Gr.70N), the material can meet impact toughness requirements down to -46°C.Upper Temperature Limit (538°C): According to ASME codes, the maximum permissible service temperature for this material in non-corrosive environments is 538°C.

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ASTM A516 Grade 70(A516GR70) Boiler and Pressure Vessel Steel Plate have high strength, good toughness, and weldability, and can withstand working conditions under high temperature and pressure.

Standard :
ASTM A516/A516M
Grade :
A516 Grade 70 (A516GR70)
Thickness :
6.0 - 300.0 mm
Width :
1,500.0 - 4,050.0 mm
Length :
3,000.0 - 15,000.0 mm

* Specifications and dimensions can be customized.

* Machining services are available.

Overview

1. What Is ASTM A516 Grade 70 (A516 Gr. 70) Boiler and Pressure Vessel Steel Plate?

A516 Gr. 70 is a high-quality carbon steel plate for pressure vessels manufactured in accordance with the ASTM A516/A516M standard, specifically designed for medium- and low-temperature boilers, pressure vessels, and industrial pressure equipment.

This steel plate features stable mechanical properties, excellent low-temperature toughness, good weldability, and reliable pressure resistance, making it a widely used structural material in the global energy, petrochemical, power generation, and storage tank engineering sectors.

The product undergoes precise chemical composition control and normalizing heat treatment to effectively eliminate internal stresses, thereby preventing the risk of deformation and cracking under high-temperature and high-pressure conditions and ensuring the long-term safe operation of industrial pressure equipment.

We supply A516 Gr. 70 steel plates in a full range of specifications and offer corresponding custom processing services. Our products strictly comply with international standards such as ASTM, ASME, and ISO, undergo 100% factory inspection, and come with complete certification documentation.

2. Grade Designation Meaning

ASTM: American Society for Testing and Materials (ASTM International).

A516: Standard Specification for Pressure Vessel Plates, Carbon Steel, for Moderate- and Lower-Temperature Service

Grade 70: Minimum tensile strength: 70 ksi (485 MPa)

Specifications and Dimensions

Product Name	ASTM A516 Grade 70 (A516GR70) Boiler and Pressure Vessel Steel Plate
Standard	ASTM A516/A516M-25: Standard Specification for Pressure Vessel Plates, Carbon Steel, for Moderate and Lower-Temperature Service
Grade	A516 Grade 70
Classification	Carbon Steel Pressure Vessel Plates for Medium- and Low-Temperature Service
Thickness	6.0 - 300 mm
Width	1,500 - 4,050 mm
Length	3,000 - 15,000 mm
Delivery Conditions	As‑Rolled (AR), Normalized (N), Quenched and Tempered (QT)
Surface Conditions	Original Hot-Rolled Black Scale, Sandblasting, Pickling, Oiling, Painting, etc.
Quality Control	All products undergo rigorous inspection and testing before leaving the factory, and factory test certificates are provided. Non-destructive testing (ultrasonic testing), Charpy V-notch impact testing, Z-axis performance testing (Z15/Z25/Z35 grade), and third-party testing (e.g., SGS) can be added according to the order.
Weldability	Excellent weldability. Care must be taken regarding preheating, selection of welding materials, interpass temperature control, and post-weld heat treatment to prevent cold cracking during welding and ensure low-temperature toughness.
MOQ	10 tons (small orders can be negotiated).
Delivery Time	15 - 20 days after order confirmation (urgent orders accepted).
Packaging	15 - 20 days after order confirmation (urgent orders accepted).
Country of origin	China

Chemical Composition

Grade	A516 Grade 70
Element	C	Mn	Si	P	S
Content (%)	≤ 0.27	0.85 - 1.20	0.15 - 0.40	≤ 0.025	≤ 0.025

Carbon Equivalent

Thickness (mm)	≤ 50	> 50
Typical CEV (wt %)	≤ 0.43	≤ 0.45

A516 Grade 70(A516GR70) is commonly used in welded structures, and its carbon equivalent is a very important indicator that directly affects the material's weldability.

Formula for calculating carbon equivalent (IIW): CEV = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15

Mechanical Properties

Property	Typical Value	Practical Significance
Yield Strength (MPa)	≥260 (thickness ≤50mm)	Critical stress for plastic deformation; affects vessel wall thickness design.
Tensile Strength (MPa)	485 - 620	Resistance to fracture; higher values may reduce ductility.
Elongation (%)	≥ 17 (50mm gauge length)	Measures ductility; higher values indicate better deformation capacity.
Charpy V-Notch Impact	≥ 20 J at -46 °C	Low-temperature toughness; essential for cryogenic applications.

Characteristics and Advantages

1. Excellent Pressure Resistance and Structural Stability at Medium and Low Temperatures

The most notable advantage of A516GR70 pressure vessel steel plates lies in their stable, continuous pressure-bearing capacity under medium and low-temperature operating conditions.

The material’s uniform internal stress distribution and excellent fatigue resistance enable it to reliably withstand long-term static high-pressure loads and frequent temperature cycling loads from boiler steam and industrial media, effectively resisting structural deformation, expansion, and localized cracking.

A516GR70 pressure vessel steel plates maintain stable mechanical properties throughout the entire service life of the equipment, fully meeting the safety design requirements for industrial pressure equipment.

2. Good Weldability and Suitability for On-Site Construction

Optimized carbon equivalent and ultra-low impurity content give A516GR70 pressure vessel steel plates excellent weldability, which is a core advantage in pressure vessel manufacturing.

This steel grade has low susceptibility to cold cracking during welding; conventional thin-to-medium-gauge plates do not require strict preheating and are compatible with various welding processes, including submerged arc welding (SAW), gas metal arc welding (GMAW), and shielded metal arc welding (SMAW).

The strength, ductility, and pressure resistance of the welded joints match those of the base material well, effectively preventing equipment failure caused by welding defects. It is suitable for on-site assembly and integral forming of boiler shells, vessel cylinders, and end sockets, significantly improving manufacturing efficiency.

3. Reliable Low-Temperature Toughness and Resistance to Brittle Fracture

A516GR70 pressure vessel steel plates possess excellent resistance to brittle fracture at low temperatures.

Under operating conditions such as low-temperature startup and shutdown of industrial equipment, as well as seasonal temperature fluctuations, they can effectively absorb impact energy, prevent sudden brittle fracture in pressure-bearing structures, and ensure safe equipment operation.

4. Ultra-Low Full Lifecycle Operation and Maintenance Costs

A516GR70 pressure vessel steel plates possess stable physical and chemical properties and exhibit good corrosion resistance against conventional industrial steam, water, and mild chemical media, ensuring a long service life for equipment.

Under standard operating conditions, compliant equipment can operate reliably for more than 25 years, significantly reducing the frequency of equipment replacement. The advantages in full lifecycle maintenance costs are prominent, resulting in significant comprehensive economic benefits for industrial mass production.

Applications

Applications of ASTM A516 Grade 70(A516GR70) Boiler and Pressure Vessel Steel Plate:

It is widely used in the manufacture of various boilers, pressure vessels, and other equipment, mainly including the following aspects:

1. Power generation industry

Be used to manufacture various power station boilers, such as coal-fired boilers, gas-fired boilers, circulating fluidized bed boilers, etc.

2. Chemical industry

Be used to manufacture various chemical equipment, such as reaction kettles, evaporators, separators, etc.

3. Oil and natural gas industry

Be used to manufacture various oil and gas transmission pipelines, oil and gas storage tanks, and other equipment.

Other Information

Manufacturing Process Characteristics

The performance of ASTM A516 Grade 70 relies on a strict manufacturing process, with key steps including:

Smelting:

Typically carried out using a Basic Oxygen Furnace (BOF) or Electric Arc Furnace (EAF) to ensure uniform chemical composition and low levels of harmful elements.

Rolling:

Hot rolling is employed, with controlled rolling temperatures (such as through Thermo-Mechanical Controlled Process, TMCP) to refine the grain structure, enhancing toughness and strength.

Heat Treatment:

Normalizing is required by the standard: The steel plate is heated above the critical point (approximately 870-910°C), held at temperature, and then air-cooled. This refines the grain structure, homogenizes the microstructure, and ensures stable mechanical properties.

For thick plates (usually >50mm), additional tempering may be necessary to reduce internal stresses.

Non-Destructive Testing (NDT):

Testing must comply with ASTM A609 standards. Common methods include:

1) Ultrasonic Testing (UT) for detecting internal defects.

2) Magnetic Particle Testing (MT) or Liquid Penetrant Testing (PT) for detecting surface defects.

3) The extent of testing (e.g., 100% UT or sampling UT) must be determined based on design requirements.

Considerations for Using ASTM A516GR70 Boiler and Pressure Vessel Steel Plate

Cleaning:

Before use, the steel plate needs to be cleaned to remove surface oil stains and impurities to avoid affecting the service life of the steel plate.

Welding:

When welding the steel plate, pay attention to the welding temperature and welding time to avoid problems such as cracks in the weld.

Processing:

When processing the steel plate, use appropriate processing technology and equipment to avoid damaging the steel plate.

Storage:

When storing the steel plate, avoid moisture, direct sunlight, etc., to avoid affecting the quality of the steel plate.

Comparison with Other Grades

The key grades of ASTM A516 (55/60/65/70) are primarily distinguished by their tensile strength:

Grade	Tensile Strength (MPa)	Yield Strength (MPa)	Key Use Case
A516 Grade 55(A516GR55)	380-515	≥ 205	Low-pressure applications
A516 Grade 60(A516GR60)	415-550	≥ 220	Intermediate pressure
A516 Grade 65(A516GR65)	450-585	≥ 240	Higher pressure
A516 Grade 70(A516GR70)	485-620	≥ 260	High-pressure & low-temp

Summary

ASTM A516 Grade 70 is a benchmark carbon-manganese steel plate for medium to low-temperature pressure vessels. Its core advantages include "moderate strength, excellent weldability, and reliable low-temperature toughness," while being more cost-effective than alloy steel plates. During selection, it is essential to specify supplementary requirements based on actual working conditions (pressure, temperature, medium) and procure the material through official channels to ensure the authenticity of quality certifications.

Attachment

Mill Test Certificate & Certificate of Origin-A516GR70.pdf

FAQ

Q1:

Can A516Gr70 pressure vessel steel plates be used in hydrogen sulphide (H₂S) environments?

Yes, provided that HIC/SCC (hydrogen-induced cracking/stress corrosion cracking) testing is carried out.

Q2:

Does A516Gr70 steel plate require post-weld heat treatment?

Thickness ≤50 mm: Not mandatory, but recommended for critical welds.

Thickness >50 mm or for use in hydrogen sulphide or wet corrosion environments: Post-weld heat treatment is mandatory to eliminate residual welding stresses and prevent hydrogen-induced cracking.

Q3:

Can A516Gr70 steel plates be used for cryogenic tanks?

Yes, A516Gr70 steel plates are suitable for the manufacture of LNG, LPG and liquid nitrogen storage tanks, but must undergo impact testing at -40°C/-46°C as required.

Q4:

Must A516Gr70 boiler and pressure vessel steel plates be supplied in a normalised condition?

Yes, the standard mandates that they be supplied in a normalised condition.

Normalising: Heating to 30–50°C above Ac3, followed by air cooling, to refine the grain structure, relieve internal stresses and significantly improve low-temperature toughness.

Hot-rolled or controlled-rolled conditions cannot consistently meet impact requirements and are not a substitute for normalisation.

Q5:

What is the applicable temperature range for ASTM A516 Grade 70 boiler and pressure vessel steel plates?

Standard Safe Temperature Range: -29°C to 343°C

This is the range recommended for long-term stable operation in engineering design. Within this temperature range, the mechanical properties of the material (such as strength and toughness) can be reliably guaranteed.

Extreme Temperature Limits: -46°C to 538°C

Lower Temperature Limit (-46°C): By using steel plates supplied in the normalised condition (commonly referred to as Gr.70N), the material can meet impact toughness requirements down to -46°C.

Upper Temperature Limit (538°C): According to ASME codes, the maximum permissible service temperature for this material in non-corrosive environments is 538°C.