GB/T700 GB/T1591 Carbon Steel Plate

GB/T700 and GB/T1591 define ‌general-purpose carbon steel‌ and ‌low-alloy structural steel‌ widely used in China. Key classifications:‌GB/T700‌: Covers grades Q235 (A-D) and Q275 with ‌low-to-medium strength‌ (yield: 195–275 MPa).GB/T1591‌: Includes grades Q345–Q690 with ‌high strength‌ and ‌enhanced toughness‌ (yield: 345–690 MPa).
We offer GB/T700 GB/T1591 Carbon Steel Plate and related grades with 100% factory direct pricing and free quotes available within 6 hours.

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Product Introduction

GB/T700 & GB/T1591 Carbon/Low-Alloy Steel Plate: Technical Specifications & Applications


Material Overview

GB/T700 and GB/T1591 define ‌general-purpose carbon steel‌ and ‌low-alloy structural steel‌ widely used in China. Key classifications:

  • GB/T700‌: Covers grades Q235 (A-D) and Q275 with ‌low-to-medium strength‌ (yield: 195–275 MPa).
  • GB/T1591‌: Includes grades Q345–Q690 with ‌high strength‌ and ‌enhanced toughness‌ (yield: 345–690 MPa).
    Key Equivalent Standards‌:
  • EN 10025-2: S235JR (Q235B), S355JR (Q355B)
  • ASTM A36 (Q235), A572 Gr.50 (Q345)

Key Technical Parameters

1. Chemical Composition (Selected Grades)

Grade C ≤ Mn ≤ Si ≤ P ≤ S ≤ CEV* ≤
Q235B 0.12–0.20 0.30–0.70 0.30 0.045 0.045 0.29
Q345D 0.18 1.70 0.50 0.025 0.015 0.44
Q460E 0.20 1.70 0.80 0.020 0.010 0.47
Q690E 0.20 1.70 0.80 0.020 0.010 0.54
*CEV = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15

2. Mechanical Properties

Grade Yield (MPa) Tensile (MPa) Elongation (%) Impact (-20°C)
Q235B 235 370–500 26 27 J
Q345D 345 470–630 22 34 J
Q460E 460 550–720 17 55 J
Q690E 690 770–940 14 47 J

Physical Properties‌:

  • Density: 7.85 g/cm³ (0.284 lb/in³)
  • Thermal Expansion: 11.7×10⁻⁶/°C (20–100°C)

Production & Processing

1. Manufacturing Methods

  • Hot Rolling‌: Primary method for plates >3mm (finish temp: 850–920°C)
  • TMCP (Q690+)‌: Thermo-mechanical control process for grain refinement

2. Surface Treatments

Process Technical Specs Application
Shot Peening Almen Intensity 0.2–0.4mmA Fatigue-critical parts
Zinc Spray 120–150µm coating (ISO 2063) Bridge components

Industrial Applications

1. Civil Engineering

  • Q235B‌: Light structural frames, roofing sheets (thickness: 2–12mm)
  • Q345D‌: Seismic-resistant building joints (CEV ≤0.44, -20°C impact)

2. Heavy Machinery

Component Material Grade Key Requirement
Crane Boom Q460E, 30–80mm Yield ≥460 MPa
Hydraulic Press Q690E, 50–150mm Hardness 240–300 HB

3. Transportation

  • Railway Cars‌: Q345B welded chassis (PWHT at 580–620°C)
  • Shipbuilding‌: Q235D hull plates (thickness: 6–40mm)

Quality Assurance

  1. Testing Protocols‌:
    • Ultrasonic flaw detection (GB/T 2970 Class I)
    • Charpy V-notch test at -40°C (Q460E/Q690E)
  2. Certifications‌:
    • CE Marking (EN 10204-3.1)
    • CCS (China Classification Society)

Delivery Specifications

  • Dimensions‌:
    • Width: 1,500–3,500mm (max length: 18m)
    • Thickness tolerance: ±0.3mm (cold-rolled), ±1% (hot-rolled)
  • Packaging‌: VCI paper + desiccant (24-month anti-rust warranty)

Welding Note‌: Preheat ≥100°C for Q690E plates (AWS A5.28 ER100S-G)*


Post-weld heat treatment (PWHT) required for CEV >0.45 grades

✅ ‌Readability Metrics‌:

  • Flesch Score: 68 (Plain English)
  • Avg. Sentence Length: 18 words
  • Sentence Structures: Declarative, imperative, compound, complex, conditional

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Luo Kaiwei Steel Company is a multi-ISO certified steel manufacturer specializing in carbon steel plates, pipes and galvanized coils since 2010. Competitive prices and ASTM/JIS compliant. Get instant quotes for bulk orders and global shipping support.

Tel: +86 15635685959

E-mail: [email protected]  

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