Q355MF Structural Steel

Home › Structural Steel › Q355MF Steel Plate

Q355MF STRUCTURAL STEEL (TMCP)

TMCP Delivery | Grade Q355MF | Yield 355MPa | Impact -60°C 27J | Ultra-Low Temperature Toughness 🔍 Q355MF Grade Lookup →

Product Overview

Q355MF is a premium Chinese grade low-alloy high-strength structural steel conforming to GB/T 1591-2018 standard. Delivered in thermomechanically rolled (TMCP) condition, it offers ultra-fine grain structure, exceptional weldability, and guaranteed extreme low-temperature toughness. The quality grade F provides impact properties at -60°C (longitudinal min. 27J). With minimum yield strength of 355MPa (≤16mm), it is the optimal choice for arctic engineering, polar infrastructure, and critical applications requiring reliable performance in the most severe cold environments.

Equivalent grades: Q355MF ↔ Q345F (previous domestic grade), EN 10025-6 S355QL (Europe, quenched & tempered), ASTM A572 Grade 50 (with enhanced low-temperature properties).

International Grade Comparison (TMCP / Q&T)

Europe (EN 10025-6)

S355QL

Impact: -40°C (40J)

Yield: 355MPa

C: ≤0.20%

Si: ≤0.80%

Mn: ≤1.70%

P: ≤0.025%

S: ≤0.015%

Nb+V+Ti: ≤0.22%

Delivery: Quenched & Tempered

China (GB/T 1591)

Q355MF

Impact: -60°C (27J)

Yield: 355MPa

C: ≤0.14%

Si: ≤0.50%

Mn: ≤1.60%

P: ≤0.020%

S: ≤0.010%

Nb: 0.01-0.05%

V: 0.01-0.10%

Ti: 0.006-0.05%

Delivery: TMCP, grade F -60°C impact

USA (ASTM A572)

Gr.50

Impact: Optional (enhanced version)

Yield: 345MPa min

C: ≤0.23%

Si: ≤0.40%

Mn: ≤1.35%

P: ≤0.025%

S: ≤0.025%

Nb+V: ≤0.15%

Note: Q355MF delivers exceptional impact toughness at -60°C, making it ideal for arctic and polar applications. S355QL is a quenched & tempered equivalent with -40°C impact; ASTM A572 Gr.50 can be supplied with enhanced low-temperature properties upon request.

China Grade Comparison: Q345F vs Q355MF (TMCP)

Q345F (Previous)

As-rolled / Normalized

Yield: 345MPa (≤16mm)

Impact -60°C: 27J

P: ≤0.020%

S: ≤0.010%

Delivery: As-rolled or normalized

Q355MF (TMCP)

TMCP (Thermomechanical Rolling)

Yield: 355MPa (≤16mm)

Impact -60°C: 27J

P: ≤0.020% (ultra-low)

S: ≤0.010% (ultra-low)

Delivery: TMCP, ultra-fine grain, superior weldability, guaranteed -60°C toughness

Key Advantages (TMCP Technology)

Higher Strength

Min yield 355MPa (≤16mm), tensile 470-630MPa.

Ultra-Low Temp Toughness

Guaranteed KV2 27J at -60°C (longitudinal).

Excellent Weldability

Ultra-low carbon equivalent, superior weldability.

Applications

Building Structures

Arctic research stations, polar infrastructure, cold-region high-rise buildings requiring extreme low-temperature reliability.

Engineering Structures

Arctic bridges, offshore platforms in polar regions, cryogenic equipment supports, heavy machinery in extreme cold environments.

Q355MF Chemical Composition (GB/T 1591-2018, TMCP)

Chemical element composition of Chinese grade Q355MF low alloy high strength structural steel

Current manufacturing execution standard: GB/T 1591-2018
Q355MF Approximate Grade Lookup Table

Grade Quality C ≤ Si ≤ Mn ≤ P ≤ S ≤
Q355M F 0.14ᵈ 0.50 1.60 0.020 0.010
Nb V Ti Cr ≤ Ni ≤ Cu ≤ Mo ≤ N ≤ B Als ≥
0.01-0.05 0.01-0.10 0.006-0.05 0.3 0.5 0.4 0.1 0.015 — 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.

Q355MF Mechanical Properties (TMCP, GB/T 1591-2018)

Upper yield strength ReH (MPa, min)

≤16mm 16-40mm 40-63mm 63-80mm 80-100mm 100-120mm
355 345 335 325 325 320

Tensile strength Rm (MPa)

≤40mm 40-63mm 63-80mm 80-100mm 100-120mm
470-630 450-610 440-600 440-600 430-590

Elongation A% (min): 22% (across all thickness ranges)

Impact KV2 (J) min – Quality F (ultra-low temperature)

Temperature Longitudinal Transverse
20°C 63 40
0°C 55 34
-20°C 47 27
-40°C 31 20
-60°C 27 16
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 Q355MF?

Thermomechanically rolled (TMCP) low-alloy high-strength steel per GB/T 1591-2018, min yield 355MPa, grade F guarantees impact 27J at -60°C.

Equivalent to S355QL?

Yes, Q355MF is comparable to EN 10025-6 S355QL (quenched & tempered) and ASTM A572 Grade 50 with enhanced low-temperature properties.

Difference Q355MF vs Q355ME?

Q355MF offers even lower impact temperature (-60°C vs -40°C) with stricter P/S limits (≤0.020%/0.010%) for ultra-low temperature applications.

Typical applications?

Arctic engineering, polar infrastructure, offshore platforms in extreme cold, cryogenic equipment supports, and buildings in the coldest regions.