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Special Steel
Overview
In high-stakes manufacturing, "standard" steel is often not enough. You need materials engineered to withstand extreme abrasion, thermal shock, millions of fatigue cycles, and cryogenic temperatures.
Promisteel Special Steel Division is your strategic partner for premium metallurgy. We integrate the supply chain of China’s leading mills (such as Baosteel, Dongbei Special Steel, and Xingcheng) to deliver materials that meet strict international standards (ASTM, EN, JIS, DIN). Whether you require Vacuum Degassed (VD) bearing steel for precision rotation or ESR (Electro-Slag Remelted) tool steel for extended die life, we deliver certified reliability.
Process Routes
EAF + LF + VD + (ESR/VAR) for maximum purity.
Quality Control
100% Ultrasonic Testing (SEP 1921 Class C/c) and Spectral Analysis.
Traceability
Full Mill Test Certificates (MTC 3.1) from ingot to final bar.
Comprehensive Product Portfolio
Mold & Tooling Solutions (Hardness & Wear)
Engineered for edge retention, toughness, and thermal fatigue resistance.
Tool Steel:
Cold Work: High-carbon, high-chrome D2 / Cr12MoV and D3 for stamping dies and slitting cutters.
Hot Work: Premium H13 (1.2344) produced via ESR for die-casting molds and extrusion dies, resisting heat checking.
Plastic Mold Steel: Pre-hardened P20 / 718H for large injection molds and corrosion-resistant S136 for medical / optical mirror polishing.
High Speed Steel (HSS): From the industry-standard M2 to cobalt-alloyed M35/M42 for cutting stainless steel and advanced PM HSS for superior toughness.
Precision & Rotation (Machinability & Fatigue)
Materials designed for automated machining and high-cycle rolling contact.
Free Cutting Steel: Featuring 12L14 / 1215 and leaded 11SMnPb30. Available in Hexagon Bars with h9 tolerance, optimized for Swiss Lathes to maximize chip breaking and tool life.
Bearing Steel:
52100 (GCr15): High purity, inclusion-controlled steel for automotive bearings.
Stainless: 440C / 9Cr18 for food and medical environments.
Aerospace: M50 (VIM-VAR) for jet engine main shafts operating at high temperatures.
Impact Resistant: Carburizing 8620 for wind turbine gearbox bearings.
Structural Engineering (Strength & Toughness)
The backbone of heavy machinery, automotive, and infrastructure.
Alloy Structural Steel:
Cr-Mo Series: 4140 / 42CrMo for high-strength shafts, gears, and bolts.
Cr-Ni-Mo Series: 4340 / 34CrNiMo6 offering deep hardenability for heavy-section components.
Mn-B Series: Cost-effective Boron Steel (10B21/15B35) for Grade 10.9 fasteners and track shoes.
Spring Steel: High yield strength alloys like 5160 and 60Si2Mn for automotive suspension and industrial coil springs.
Energy & Extreme Environments (Critical Performance)
Materials that survive where others fail: Extreme Heat, Cryogenic Cold, and High Pressure.
Pressure Vessel Steel:
Boiler Plate: A516 Gr 70 (Normalized) and HIC-Resistant plates for sour gas service.
Gas Cylinder: 34CrMo4 / 4130X seamless tubes with superior concentricity.
★ Cryogenic Flagship: 9% Nickel Steel. We offer rare 5 mm ultra-thin plates for 270,000 m³ LNG tanks, tested at -196°C for crack arrest properties.
Heat Resistant Steel: Austenitic 310S / 1.4841 is capable of continuous operation at 1150°C in industrial furnaces.
Why Partners Choose Promisteel?
The "Hard-to-Find" Specifications
Stockists often fail when you need non-standard sizes. We specialize in the difficult.
Ultra-thin 5mm 9% Nickel Steel for LNG tank inner shells.
Cold Drawn Hexagon Bars in 12L14/1215 for Swiss Lathe efficiency.
Extra-Wide Forged Blocks for massive automotive molds.
Technical Integrity & Anti-Counterfeit
In the special steel market, grade substitution is a hidden risk. We guarantee chemical consistency and hardenability band control. What you order is exactly what you get—verified by third-party labs (SGS/TUV).
Flexible MOQ & Customization
We bridge the gap between the mill's MOQ and distributor stock. Whether it's a single forged block for a prototype or a 500-ton project order for alloy structural steel, we adapt our logistics to your timeline.
Beyond Raw Material: Processing Services
We reduce your machining cycle time and scrap rate by delivering near-net-shape materials.
Precision Cutting
Band saw cutting (up to 1200mm section) and Flame/Plasma/Laser cutting for plates.
Surface Finishing
Milling: 6-sides milling for mold blocks (Tolerance +/- 0.5mm).
Grinding: Centerless grinding for bars (ISO h7/h8/h9).
Peeling: Bar peeling to remove surface defects and decarburization.
Heat Treatment
Spheroidize Annealing for cold heading; Normalizing for structural uniformity; Quenching & Tempering (QT) for pre-hardened delivery.
Technical Insights & Selection Guides
Expert advice to help you choose the right steel for your application.
coming soon...