Q500MC STRUCTURAL STEEL (TMCP)
Product Overview
Q500MC is a Chinese grade low-alloy high-strength structural steel conforming to GB/T 1591-2018 standard. Delivered in thermomechanically rolled (TMCP) condition, it offers refined grain structure, excellent weldability, and guaranteed low-temperature toughness. The quality grade C provides impact properties at 0°C (longitudinal min. 55J). With minimum yield strength of 500MPa (≤16mm), it delivers superior strength for heavy engineering structures, high-rise buildings, and demanding infrastructure projects.
International Grade Comparison
Europe (EN 10025-4)
S500ML
Impact: -50°C (27J)
Yield: 500MPa
C: ≤0.16%
Si: ≤0.60%
Mn: ≤1.80%
P: ≤0.025%
S: ≤0.020%
China (GB/T 1591)
Q500MC
Impact: 0°C (55J)
Yield: 500MPa
C: ≤0.18%
Si: ≤0.60%
Mn: ≤1.80%
P: ≤0.030%
S: ≤0.030%
TMCP Delivery
USA (ASTM A656)
Gr.80
Impact: -20°C (optional)
Yield: 550MPa min
C: ≤0.18%
Si: ≤0.60%
Mn: ≤1.80%
P: ≤0.025%
S: ≤0.020%
China Grade Comparison: Q500C vs Q500MC
Q500C (Previous)
Yield: 500MPa (≤16mm)
Impact 0°C: 55J
C: ≤0.20%
Delivery: As-rolled or normalized
Q500MC (TMCP)
Yield: 500MPa (≤16mm)
Impact 0°C: 55J
C: ≤0.18% (lower carbon)
Delivery: TMCP, refined grain
Key Advantages
Ultra-High Strength
Min yield 500MPa, tensile 610-770MPa.
0°C Impact Toughness
Guaranteed KV2 55J at 0°C.
Excellent Weldability
Optimized TMCP process.
Applications
Building Structures
High-rise buildings, stadiums, industrial plants.
Engineering Structures
Bridge girders, towers, offshore platforms.
Q500MC Chemical Composition
GB/T 1591-2018, TMCP
| Grade | Quality | C ≤ | Si ≤ | Mn ≤ | P ≤ | S ≤ |
|---|---|---|---|---|---|---|
| Q500M | C | 0.18 | 0.60 | 1.80 | 0.030 | 0.030 |
| Nb | V | Ti | Cr ≤ | Ni ≤ | Cu ≤ | Mo ≤ | N ≤ | B ≤ | Als ≥ |
|---|---|---|---|---|---|---|---|---|---|
| 0.01-0.11 | 0.01-0.12 | 0.006-0.05 | 0.6 | 0.8 | 0.55 | 0.2 | 0.015 | 0.004 | 0.015 |
Notes: The steel shall contain at least one grain-refining element (Al, Nb, V, Ti) with content not less than lower limit. All-aluminum (Alt) min 0.02% if substituted.
Mechanical Properties
Upper yield strength ReH (MPa, min)
| ≤16mm | 16-40mm | 40-63mm | 63-80mm | 80-100mm | 100-120mm |
|---|---|---|---|---|---|
| 500 | 490 | 480 | 460 | 450 | — |
Tensile strength Rm (MPa)
| ≤40mm | 40-63mm | 63-80mm | 80-100mm | 100-120mm |
|---|---|---|---|---|
| 610-770 | 600-760 | 590-750 | 540-730 | — |
Elongation A% (min): 17%
Impact KV2 (J) min – Quality C (0°C)
| Direction | 0°C |
|---|---|
| Longitudinal | 55 |
| Transverse | 34 |
Size & Specification
| Product | Thickness (mm) | Width (mm) | Length (mm) |
|---|---|---|---|
| Plate | 3-100 | 1000-4000 | 3000-18000 |
| Sheet/Coil | 1.5-20 | 900-2000 | Coil or cut length |
Custom sizes and cutting available upon request.
Customizable Options
Laser/plasma cutting, edge beveling, shot blasting, priming, third-party inspection, custom marking.
Quality Assurance
Spectral analysis, tensile & impact, ultrasonic
Full traceability & EN10204 docs
Packaging & Logistics
Request a Quote
Direct email: customize@cehesteel.com – reply within 2 hours.
Frequently Asked Questions
TMCP low-alloy high-strength steel per GB/T 1591-2018, min yield 500MPa, grade C guarantees impact 55J at 0°C.
Yes, comparable to EN 10025-4 S500ML and ASTM A656 Grade 80.
Q500MC features lower carbon (≤0.18%), TMCP delivery ensures refined grain structure.
Engineering structures (bridges, towers, offshore) and building structures (high-rise buildings).