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GB/T 700 Q235A Carbon Steel Plate

Q: 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.

Q: 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.

Q: 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.

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GB/T 700 Q235A steel plate is an ordinary carbon structural steel plate characterized by low cost and good workability, suitable for manufacturing static general structures that do not require high toughness or welding performance.

Standard :
GB/T 700
Grade :
Q235A
Thickness :
3 - 100 mm
Width :
1500 - 2500 mm
Length :
3000-12000 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

GB/T 700 Q235A is a widely used and low-cost carbon steel plate, highly suitable for general manufacturing and construction projects where high impact toughness is not a primary design requirement. Its main advantages include low cost, high strength, ease of welding, and processability.

Yuxin Steel supplies GB/T 700 Q235A Carbon Steel Plates in the following specifications:

Thickness: 3 - 100 mm

Width: 1500 - 2500 mm

Length: 3000 - 12000 mm

Grade	Q235A
Standard	GB/T 700: Chinese Standard Code - Carbon Structural Steel
Classification	Hot-rolled Structural Steel
Delivery Conditions	Hot-rolled
Approval By Third Party	ABS, DNV, GL, CCS, LR , RINA, KR, TUV, CE
Weldability	Good weldability
Machinability	Good machinability (Easily undergoes cold working such as shearing, stamping, and bending.)
Surface Quality	Default surface in hot-rolled condition. Additional treatments such as Shot Blasting, Sandblasting, Painting and Galvanized can be required upon request.
Quality Control	Provide Certificate of Quality

Chemical Composition

Grade	Q235A
Element	C	Si	Mn	P	S
Content (max, %)	0.22	0.35	1.40	0.045	0.050

* Note: The chemical composition of Q235A Carbon Steel Plate is not a delivery condition, and usually only the mechanical properties are guaranteed. However, its actual content generally falls within the above range.

Mechanical Properties

Grade	Thickness (t) [mm]	Yield Strength (ReH) [min, MPa]	Tensile Strength (Rm) [MPa]	Elongation (A) [min, %]	Impact Energy (KV) [min]
Q235A	t ≤ 16	235	370 - 500	26	Not required
	16 < t ≤ 40	225	370 - 500	25	Not required
	40 < t ≤ 60	215	370 - 500	24	Not required
	60 < t ≤ 100	215	370 - 500	23	Not required
	100 < t ≤ 150	195	370 - 500	22	Not required
	150 < t ≤ 200	185	370 - 500	21	Not required

* The yield strength of Q235A Carbon steel Plate decreases significantly with increasing thickness.

Applications

GB/T 700 Q235A carbon steel plate is used in general structures and engineering applications, and is not suitable for withstanding dynamic loads or critical welded structures.

1. Construction field: Used for manufacturing beams, columns, and purlins in steel structure factory buildings, steel structural frames and supports in civil buildings, as well as embedded parts in reinforced concrete.

2. Mechanical manufacturing: Used for producing mechanical parts subjected to low stress, such as gears, shaft sleeves, flanges, bases, brackets, etc. It can also serve as raw material for equipment housings.

3. Engineering structures: Used for auxiliary bridge structures, power transmission towers, communication towers, container frames, and various temporary steel structural platforms.

4. Pipes and profiles: Extensively used in the production of seamless steel pipes, welded steel pipes, angle steel, channel steel, I-beams, flat steel, and other common steel profiles to meet the infrastructure needs of various industries.

Other Information

Difference In Quality Grades

Quality Grade	Impact Test Requirements	Sulfur (S) Content	Phosphorus (P) Content	Applicable Scenarios
Q235A	No impact test required	≤ 0.050%	≤ 0.045%	Static structures, non-load-bearing structures
Q235B	Impact test at room temperature (20°C)	≤ 0.045%	≤ 0.045%	General structural components in room temperature environments
Q235C	Impact test at 0°C	≤ 0.040%	≤ 0.040%	Structural components in slight low-temperature environments
Q235D	Impact test at -20°C	≤ 0.035%	≤ 0.035%	Structural components in low-temperature environments

* The core differences between different quality grades of Q235 steel plates lie in the impact test requirements and the content of harmful elements (Phosphorus and Sulfur).

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.