Low Alloy Steel
Low Alloy Steel - 图片 2

Low Alloy Steel

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Carbon steel plates are iron-carbon alloy plates with carbon as the main alloying element. Common models include Q235B, Q345B, SS400, A36, S45C, SPCC, etc. The products are divided into hot-rolled carbon steel plates and cold-rolled carbon steel plates, covering low-carbon steel, medium-carbon steel, high-carbon steel and high-strength structural steel series. The thickness range is 1mm – 200mm.

Email：melody@baosteelgroups.com
Whatsapp：+86 15864003919

Baosteel
Baosteel

1. How to get samples to check the quality? How long can I get the samples?
After the price is confirmed, samples can be provided for your evaluation. After confirming the sample details, the samples will be ready for delivery within 3-7 days, and sent to you by courier, and arrive within 3-5 days.
2.Do you provide samples ? is it free or extra ?
Answer:The sample could can provide for customer with free,but the courier freight will be covered by customer account.
3. Do you accept the third party inspection?
Answer: Yes absolutely we accept.
4.Can you accept customization?
Answer:Yes. If you have special requirements on products or packages, we can do customization for you.
5.How do you control the quality?
Answer:We have professional inspectors to analyze chemical composition of raw materials and test the finished products strictly according to standard stipulated in the contract.  In this process, Internal and external surfaces, two ends appearance, bending degree, fixed length, outer diameter and wall thickness dimension etc will be checked one by one.  You can be assured that all the products you get from us are reliable.

Baosteel
Grade SystemTypical GradesExecution StandardSurface ConditionCommon Size (mm)Yield Strength (MPa)Tensile Strength (MPa)Elongation (%)Main Application Fields
GB (China)Q355B/C/D/EGB/T 1591-2018Hot rolled black skin, pickled, painted, galvanizedPlate: 6–200≥355 (≤16mm)470–630≥21Building steel structure, bridge, engineering machinery, pressure vessel, vehicle
Strip: 2.0–25.0
Q345RGB/T 713-2023Hot rolled, normalized, ultrasonic tested6–150≥345470–630≥21Pressure vessel, boiler drum, storage tank, chemical equipment
EN (Europe)S355JR/J0/J2EN 10025-2Hot rolled, pickled, coated3–250≥355 (≤16mm)470–630≥21Steel structure, bridge, machinery manufacturing, ship, pipeline
16Mo3EN 10028Hot rolled, normalized3–80≥260440–590≥22Boiler, heat exchanger, medium & high temperature pressure vessel
JIS (Japan)SM400CJIS G3106Hot rolled, pickled6–250≥245400–510≥23Ship, bridge, engineering machinery, automobile chassis
SPFH540JIS G3134Hot rolled & pickled2.0–16.0≥355540≥21Automotive structural parts, high-strength stamping parts, engineering machinery
ASTM (USA)A572 Gr.50ASTM A572Hot rolled, coated6–150≥345450–600≥18Building, bridge, transmission tower, heavy machinery
A516 Gr.70ASTM A516Hot rolled, normalized6–200≥260485–620≥21Low-temperature pressure vessel, storage tank, chemical equipment

II. Key Information Specifications

1. Surface Condition
Hot Rolled Black: Original rolled surface with oxide scale coating. Low cost, suitable for structural components where appearance and corrosion resistance are not required.
Pickled: Oxide scale removed, resulting in a smooth surface conducive to welding, painting, and stamping. Examples include automotive-grade SPFH540.
Zinc/ZF Coating: Corrosion-resistant coating for outdoor or humid environments, e.g., highway guardrails, structural steel components.
Painted/Coated: Secondary corrosion protection for enhanced weather resistance.
2. Dimension Range
Plate: Thickness 3–250 mm, width 1000–2500 mm, length 2000–12000 mm.
Coil: Thickness 2.0–25.0 mm, width 700–1830 mm, inner diameter 508/610 mm.
Sections: H-beams, I-beams, angles, channels for steel structural frameworks.
3. Key Performance Characteristics
Yield Strength: Slightly decreases with increasing thickness (e.g., Q355 with thickness >16 mm follows standard gradient reduction).
Impact Toughness: Quality grades (B/C/D/E, JR/J0/J2) correspond to different temperature impact requirements (e.g., Q355E meets -40°C impact).
Weldability: Designed for low-carbon, low-alloy steel with good weld heat-affected zone toughness, suitable for various welding processes.

III. Grade Selection Guide

General Structures: Prioritize Q355 (Chinese standard) or S355 (European standard) for high cost-effectiveness and broad applicability.
Pressure Vessels: Select Q345R (Chinese standard), 16Mo3 (European standard), or A516 Gr.70 (American standard) for enhanced high/low-temperature toughness and pressure stability.
Automotive / Lightweight Applications: Select SPFH540 (Japanese Standard) for pickled surfaces, high strength, and excellent formability.
Shipbuilding / Offshore: Select SM400C (Japanese Standard) for superior low-temperature toughness, suitable for ice zones and marine environments.

 

Baosteel

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