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ASTM A573 Grade 70 (A573GR70) Structural Carbon Steel Plate

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ASTM A573 Grade 70 (A573GR70) is a high-strength, high-toughness carbon-manganese-silicon structural steel plate, particularly suitable for critical structural applications requiring good weldability and low-temperature toughness. It is widely used in pressure vessels, storage tanks, construction, and the energy sector.

Standard :
ASTM A573/A573M
Grade :
A573 Grade 70 (A573GR70)
Thickness :
0.8 - 30.0 mm
Width :
800.0 - 2500.0 mm
Length :
3000.0 - 12000.0 mm

Special thickness, width, and length can be negotiated separately.
We also provide customized processing services.If you have any questions, please contact us.

Overview

ASTM A573 Grade 70 is a carbon-manganese-silicon structural steel plate with improved toughness, offering good strength and low-temperature toughness. Its most notable feature is the excellent mechanical properties obtained through the normalizing heat treatment process. It is primarily used in ambient temperature structural applications requiring enhanced notch toughness. With a tensile strength range of 70-90 ksi (485-620 MPa), it is the highest strength grade in the A573 standard (surpassing Grade 58 and Grade 65). This makes it particularly suitable for pressure vessels, storage tanks, and critical structural components that require welding.

Grade	A573 Grade 70 (A573GR70)
Standard	ASTM A573/A573M: Standard Specification for Structural Carbon Steel Plates of lmproved Toughness
Delivery Conditions	Normalized
Weldability	Good weldability with a reduced risk of cold cracking. Preheating and post-weld heat treatment (if required) can further improve welding quality.
Machinability	Low cutting difficulty, small tool wear, good ductility, easy to shape.
Surface Treatment	Pre-treatments such as sandblasting, painting, and galvanizing can be provided to enhance corrosion resistance.
Quality Control	Material certificate,tensile testing, chemical composition analysis, ultrasonic testing (UT), etc.

Mechanical Properties

Grade	Yield Strength (ReH) [min, MPa]	Tensile Strength (Rm) [MPa]	Elongation (A) [min, %]
A573 Grade 70 (A573GR70)	290	485 - 620	18

Applications

ASTM A573 Grade 70 (A573GR70) steel plates are widely used in the following fields due to their excellent toughness and weldability:

1. Construction: Used in bridges, high-rise buildings, and industrial facilities, where it can withstand heavy loads and stresses, ensuring structural safety and stability.

2. Machinery Manufacturing: Suitable for producing mechanical components like gears, shafts, and molds, meeting requirements for strength, toughness, and wear resistance.

3. Petrochemical Industry: Commonly used in reactors, heat exchangers, separators, spherical storage tanks, oil and gas tanks, and liquefied gas tanks, capable of withstanding high temperatures, pressures, and corrosive media.

4. Power Industry: Applied in boilers, pressure vessels, and steam turbine blades, ensuring the safe operation of power equipment.

Other Information

Advantages and Disadvantages

Advantages: Offers excellent strength and toughness, enabling it to bear heavy loads while maintaining good deformation and fracture resistance; exhibits good weldability and is easy to process into various structural components; cost-effective and suitable for large-scale engineering projects.

Disadvantages: Relatively weak corrosion resistance, prone to rust and corrosion in humid or acidic/alkaline environments, necessitating anti-corrosion treatments; limited heat resistance, with performance stability inferior to heat-resistant steels at high temperatures, restricting its applicable temperature range.

Comparison with Other Grades:

Grade	Yield Strength (ReH) [min, MPa]	Tensile Strength (Rm) [MPa]	Elongation (A) [min, %]
A573 Grade 70 (A573GR70)	290	485 - 620	18
A573 Grade 65 (A573GR65)	240	450 - 530	20
A573 Grade 58 (A573GR58)	220	400 - 490	21

Comparable Standards:

EN Equivalent: S355JR (similar properties, but not exact)

FAQ

Q1:

What are the weldability characteristics of high-strength low-alloy steel plates?

High-strength low-alloy steel plates offer excellent weldability. As their carbon content is typically low (below 0.2%), they present a lower risk of cracking during welding compared to standard high-strength steel plates and generally do not require complex preheating treatments.

Q2:

Why are high-strength low-alloy steels the preferred choice in construction and automotive manufacturing?

The key advantage of high-strength low-alloy steels is weight reduction. As they offer greater strength, thinner sheets can be used to withstand the same loads, thereby reducing the overall weight of the structure; in the automotive sector, this leads to improved fuel efficiency.

Q3:

What is high-strength low-alloy steel (HSLA)?

High-strength low-alloy steel (HSLA) is a type of steel in which small amounts of alloying elements (such as niobium, vanadium, titanium or copper) are added to enhance its mechanical properties. Compared to traditional carbon steel, it offers higher yield strength and better corrosion resistance whilst maintaining good weldability and formability.