High Strength Steel Plate Q620E
Products Description High Strength Steel Plate Q620E is a high-performance low-alloy structural steel renowned for its exceptional strength, toughness, and cold resistance. The "Q" denotes "quasi-static strength," "620" indicates a minimum yield strength of 620 MPa,...
Description
Products Description
High Strength Steel Plate Q620E is a high-performance low-alloy structural steel renowned for its exceptional strength, toughness, and cold resistance. The "Q" denotes "quasi-static strength," "620" indicates a minimum yield strength of 620 MPa, and "E" signifies superior impact resistance at extremely low temperatures (-40°C). Below is a detailed overview of its characteristics, applications, and standards:
1. Mechanical Properties
Q620E delivers outstanding strength and ductility, even at sub-zero temperatures. 其力学性能 (mechanical properties)*:
| Property | Standard Requirement |
|---|---|
| Yield Strength (Rp0.2) | ≥620 MPa (thickness ≤50mm) |
| Tensile Strength (Rm) | 700–850 MPa |
| Elongation (A5) | ≥14% |
| Impact Toughness (KV2) | ≥34 J at -40°C (thickness ≤150mm) |
Key Features:
High Strength: Significantly stronger than common structural steels (e.g., Q345).
Excellent Low-Temperature Toughness: Suitable for applications in cold climates or cryogenic environments.
Weldability: Achievable with proper preheating and post-weld heat treatment.
2. Production Process
Q620E is produced using advanced metallurgical techniques to ensure consistency and quality:
Clean Steelmaking: Low-impurity melting via converter or electric furnace, often with LF (Ladle Furnace) refining.
Controlled Rolling: Thermo-mechanical controlled processing (TMCP) to refine the microstructure.
Quenching & Tempering (QT): Heat treatment to achieve a uniform tempered martensite/bainite structure, optimizing strength-toughness balance.
Non-Destructive Testing (NDT): Mandatory ultrasonic testing (UT) for critical applications to detect internal flaws.
3. Standards and Specifications
Q620E complies with Chinese national and international standards:
Primary Standards:
GB/T 16270-2009: High-Strength Structural Quenched and Tempered Steel Plates (defines mechanical requirements for QT steels).
GB/T 1591-2018: Low-Alloy High-Strength Structural Steel (covers chemical composition and general properties).
International Equivalents:
EN 10025-6: S620QL (European standard, similar mechanical properties).
ASTM A572/A572M: Grade 90 (lower toughness at sub-zero temperatures).
Why Choose Us?
We take pride in our ability to provide custom solutions for our customers' unique needs.
We analyze and compare the previous products and the current technical situation of our High Strength Steel Plate Q620E, and develop new technical specifications and processes.
Our customers trust us to deliver high-quality Cold-rolled Steel products on time and on budget.
We strictly implement the warm and thoughtful after-sales service, adhere to the development of good professional ethics.
We offer a wide range of Cold-rolled Steel products to meet diverse customer needs.
We adhere to the customer-centric and brand-oriented business philosophy, and continue to provide customers with reliable and excellent products and services.
Our factory is committed to upholding the highest standards of safety and quality.
All staff of our company and all departments work together to combine business management, professional technology, quantitative statistical methods and ideological education.
Our Cold-rolled Steel products are known for their durability and reliability.
Relying on the superior conditions and strong advantages of mass production, we are able to meet the different needs of our customers.
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