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GB/T 700 Q275 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 Q275 Steel Plate is a medium-strength carbon structural steel plate, mainly used for structural components and mechanical parts that require a certain level of strength.

Standard :
GB/T 700
Grade :
Q275
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 Q275 is a grade of carbon structural steel plate under China standard. It is classified as medium-strength carbon steel, featuring good plasticity and machinability, and medium weldability . It is mainly used for structural components and mechanical parts that require a certain level of strength.

Grade	Q275
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	Weldability is moderate, and appropriate preheating and welding process measures must be taken to prevent cracking.
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	Q275
Element	C	Si	Mn	P	S
Content (max, %)	0.24	0.55	1.60	0.050	0.045

Mechanical Properties

Grade	Thickness (t) [mm]	Yield Strength (ReH) [min, MPa]	Tensile Strength (Rm) [MPa]	Elongation (A) [min, %]
Q275	t ≤ 16	275	410 - 540	22
	16 < t ≤ 40	265	410 - 540	21
	40 < t ≤ 60	255	410 - 540	21
	60 < t ≤ 100	245	410 - 540	20
	100 < t ≤ 150	225	410 - 540	19

* The strength decreases with increasing thickness. Charpy V-notch impact testing is not mandatory.

Applications

Q275 Carbon Steel Plate offers higher strength and lower cost compared to low-alloy steel plates. It is primarily used in applications where strength requirements exceed those of Q235. Common applications include:

1. Machinery manufacturing: Producing components such as gears, shafts, bolts, and nuts that withstand moderate loads.

2. Engineering structures: Used for support members in construction, structural components of tower cranes, and frames of small engineering machinery.

3. Other fields: Manufacturing welded or stamped parts requiring higher strength, or serving as shell materials for certain equipment.

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.