Q460MD Structural Steel

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Q460MD STRUCTURAL STEEL (TMCP)

TMCP Delivery | Grade Q460MD | Yield 460MPa | Impact -20°C 40J | Excellent Low-Temperature Toughness 🔍 Q460MD Grade Lookup →

Product Overview

Q460MD 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 D provides impact properties at -20°C (longitudinal min. 40J). With minimum yield strength of 460MPa (≤16mm), it is ideal for bridges, high-rise buildings, and engineering structures requiring reliable performance in cold environments.

Equivalent grades: Q460MD ↔ Q460D (previous domestic grade), EN 10025-4 S460M / S460ML (Europe), ASTM A572 Grade 65 (USA).

International Grade Comparison (TMCP / Thermomechanical Rolling)

Europe (EN 10025-4)

S460M

Impact: -20°C (40J)

Yield: 460MPa (≤16mm)

C: ≤0.16%

Si: ≤0.60%

Mn: ≤1.70%

P: ≤0.025%

S: ≤0.020%

Nb+V+Ti: ≤0.22%

Delivery: TMCP

Europe (EN 10025-4)

S460ML

Impact: -50°C (27J)

Yield: 460MPa

C: ≤0.16%

Si: ≤0.60%

Mn: ≤1.70%

P: ≤0.025%

S: ≤0.020%

Nb+V+Ti: ≤0.22%

Delivery: TMCP, grade ML

China (GB/T 1591)

Q460MD

Impact: -20°C (40J)

Yield: 460MPa

C: ≤0.16%

Si: ≤0.60%

Mn: ≤1.70%

P: ≤0.030%

S: ≤0.025%

Nb: 0.01-0.05%

V: 0.01-0.12%

Ti: 0.006-0.05%

Delivery: TMCP, grade D -20°C impact

USA (ASTM A572)

Gr.65

Impact: Not specified

Yield: 450MPa min

C: ≤0.26%

Si: ≤0.40%

Mn: ≤1.45%

P: ≤0.025%

S: ≤0.025%

Nb+V: ≤0.15%

Cu: ≤0.60%

Note: Q460MD is delivered in TMCP condition, offering refined grain structure and guaranteed impact toughness at -20°C. S460M offers similar yield with -20°C impact; S460ML offers -50°C impact; ASTM A572 Gr.65 provides comparable strength (450MPa min) with optional impact requirements.

China Grade Comparison: Q460D vs Q460MD (TMCP)

Q460D (Previous)

As-rolled / Normalized

Yield: 460MPa (≤16mm)

Impact -20°C: 40J

C: ≤0.18%

P: ≤0.030%

S: ≤0.025%

Delivery: As-rolled or normalized

Q460MD (TMCP)

TMCP (Thermomechanical Rolling)

Yield: 460MPa (≤16mm)

Impact -20°C: 40J

C: ≤0.16% (lower carbon)

P: ≤0.030%

S: ≤0.025%

Delivery: TMCP, refined grain, superior weldability, guaranteed -20°C toughness

Key Advantages (TMCP Technology)

High Strength

Min yield 460MPa (≤16mm), tensile 540-720MPa.

-20°C Impact Toughness

Guaranteed KV2 40J at -20°C (longitudinal).

Excellent Weldability

Low carbon equivalent, optimized TMCP process.

Applications

Building Structures

High-rise buildings, stadiums, industrial plants, cold-region construction requiring -20°C impact reliability.

Engineering Structures

Bridge girders, transmission towers, offshore platforms, heavy machinery, infrastructure in cold climates.

Q460MD Chemical Composition (GB/T 1591-2018, TMCP)

Chemical element composition of Chinese grade Q460MD low alloy high strength structural steel

Current manufacturing execution standard: GB/T 1591-2018
Q460MD Approximate Grade Code Lookup Table

Grade Quality C ≤ Si ≤ Mn ≤ P ≤ S ≤
Q460M D 0.16ᵈ 0.60 1.70 0.030 0.025
Nb V Ti Cr ≤ Ni ≤ Cu ≤ Mo ≤ N ≤ B Als ≥
0.01-0.05 0.01-0.12 0.006-0.05 0.3 0.8 0.4 0.2 0.025 — 0.015

Notes: a. For structural steel and bars, P/S can increase by 0.005%. b. Ti can be as high as 0.2%. c. All-aluminum (Alt) min 0.02% if substituted; grain-refining elements rule applies. d. For structural steel and bars, max carbon content can be increased by 0.02%.

The steel shall contain at least one grain-refining element (Al, Nb, V, Ti) with content not less than lower limit.

Q460MD Mechanical Properties (TMCP, GB/T 1591-2018)

Upper yield strength ReH (MPa, min)

≤16mm 16-40mm 40-63mm 63-80mm 80-100mm 100-120mm
460 440 430 410 400 380

Tensile strength Rm (MPa)

≤40mm 40-63mm 63-80mm 80-100mm 100-120mm
540-720 530-710 510-690 500-680 490-660

Elongation A% (min): 17% (across all thickness ranges)

Impact KV2 (J) min – Quality D

Temperature Longitudinal Transverse
20°C 55 31
0°C 47 27
-20°C 40 20
Note: Thermomechanically rolled (TMCP) condition includes TMCP + tempered condition. If yield not obvious, use Rp0.2. For thickness >120mm, consult technical specifications.

Size & Specification

Product Thickness (mm) Width (mm) Length (mm)
Plate 3-120 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

Full Testing
Spectral analysis, tensile & impact, ultrasonic
MTC 3.1/3.2
Full traceability & EN10204 docs

Packaging & Logistics

Bundled with steel straps, waterproof wrapping, clear marking. FOB, CIF, CFR from major Chinese ports. Lead time: 25-35 days.

Request a Quote

Direct email: customize@cehesteel.com – reply within 2 hours.

Frequently Asked Questions

What is Q460MD?

Thermomechanically rolled (TMCP) low-alloy high-strength steel per GB/T 1591-2018, min yield 460MPa, grade D guarantees impact 40J at -20°C.

Equivalent to S460M?

Yes, Q460MD is comparable to EN 10025-4 S460M / S460ML and ASTM A572 Grade 65. S460M offers similar yield with -20°C impact; S460ML offers -50°C impact.

Difference Q460MD vs Q460D?

Q460MD features lower carbon content (≤0.16% vs ≤0.18%), TMCP delivery ensures refined grain structure, better weldability, and consistent properties.

Typical applications?

Engineering structures (bridges, towers, offshore) and building structures (high-rise, industrial facilities) requiring -20°C impact toughness.