5H12 Tool Steel | 5Cr5MoWVSi | High-Carbon Hot Work Tool Steel Supplier
5H12 tool steel(5Cr5MoWVSi) is a premium high-carbon hot work die steel distinguished by its chromium-molybdenum-tungsten-vanadium alloy system . With approximately 0.50-0.55% carbon—significantly higher than conventional H11 or H13—it delivers superior hardness and edge retention after heat treatment . The tungsten addition (1.00-1.50%) further enhances hot strength and wear resistance for demanding applications.
What makes 5H12 steel unique is its dual-purpose nature: it functions effectively as both a hot work die steel for forging and die casting, and as a blade steel for industrial knives requiring exceptional sharpness and edge retention . Comparable to AISI H12 and DIN 1.2606, though with higher carbon content for improved wear performance . Ideal for hot forging dies, die casting molds, and industrial knife blades. Available annealed for machinability or pre-hardened for immediate use.
Material Shape and Size of 5H12 Tool Steel
1.Round Bar
- Hot Rolled Φ16mm-Φ400mm, Forged Φ140mm-Φ800mm, Length 3000mm-5800mm
- Surface: Black skin/peeled/turned/polished
- Tolerance: GB/T 702-2016
Flat Bar
- Flat Bar 12mm-150mm×50mm-300mm, Square Bar 20mm-200mm, Length 3000mm-6000mm
- State: Annealed (≤250 HB) or pre-hardened
5H12 Equivalent
|
Standard System |
Country/Region |
Equivalent Grade |
Common Search Terms |
|---|---|---|---|
|
DIN EN |
Germany |
1.2606 (similar) |
1.2606 steel, DIN 1.2606 |
|
AISI/ASTM |
USA |
H12 (similar) |
H12 tool steel, AISI H12, H12 steel, H12 material |
|
JIS |
Japan |
SKD62 steel |
SKD62 (similar) |
|
GB |
China |
5Cr5MoWVSi, 5H12 |
5H12 steel, 5Cr5MoWVSi |
5H12 Steel Composition
|
Element |
C |
Si |
Mn |
P |
S |
Cr |
Mo |
V |
W |
|---|---|---|---|---|---|---|---|---|---|
|
Content (%) |
0.45-0.55 |
0.80-1.20 |
0.20-1.50 |
≤0.030 |
≤0.030 |
4.75-5.50 |
1.00-1.75 |
0.40-0.60 |
1.00-1.50 |
The defining feature of 5H12 tool steel is its higher carbon content (0.45-0.55%), which provides superior hardness and wear resistance after heat treatment . Tungsten (1.00-1.50%) enhances hot strength, while chromium ensures deep hardenability. Vanadium (0.40-0.60%) refines grain structure and improves wear resistance
5H12 Steel Property
|
Mechanical Property |
Minimum Value |
METRIC VALUE |
|
|---|---|---|---|
|
Hardness (Annealed) |
≤ 229 – 250 HB |
≤ 229 – 250 HB |
|
|
Hardness (Quenched & Tempered) |
58 – 60 HRC |
58 – 60 HRC |
|
|
Impact Toughness (KV, 20°C, Longitudinal) |
≥ 32.4 J/cm² |
≥ 154.2 ft·lb/in² |
% |
Delivery Condition of 5H12 Tool Steel
Black Surface, Bright Surface, Turned Surface, Grinded Surface, Poblished surface.
5H12 Tool Steel Application
Industrial Knives and Blades: Steel plate shear blades, circular knives for rolling mills, slitter knives, and industrial cutting tools
Hot Forging Industry: Hot forging dies, closed-die and open-die forging tools, forging press dies for steel and metal forming
Die Casting Industry: Aluminum and zinc die casting molds, die casting components for non-ferrous alloys
Extrusion Industry: Hot extrusion dies, extrusion tooling for non-ferrous metals
Rolling Mill Rolls: Work rolls for steel plate rolling, cold rolling applications
Hot Punches and Forming Tools: Heavy-duty punches, heading tools, hot forming dies
Mining and Tunneling: Shield machine cutter blades and wear-resistant components
Automotive Tooling: Wheel mold dies, stamping tools requiring high wear resistance
Heat Treatment & Processing of 5H12 Tool Steel
Heat Treatment:
Soft Annealing: Temperature 800-840°C (1470-1540°F), hold 4-6 hours, furnace cool. Resulting hardness ≤250 HB, optimized for machinability
Stress Relieving: Temperature 600-650°C (1110-1200°F), hold 1-2 hours, air cool. Reduces distortion during hardening
Preheating: Recommended to minimize thermal shock during austenitizing
Hardening (Austenitizing): Temperature 1000-1050°C (1830-1920°F). Quenching medium: Oil, air, or warm bath (approximately 540°C). Hardness after quenching: 57-60 HRC
Tempering: Double tempering strongly recommended. Temper immediately after quenching while tool is still warm.
Processing Guide:
Forging: Hot forming temperature 900-1100°C (1650-2010°F). Slow cool after forging to prevent cracking
Quality Inspection & Control of AISI 5H12
Full-process control: Raw material inspection (certificate, composition); production inspection (composition, mechanical properties, 100% UT, dimensional, surface); finished product inspection (MTC EN 10204 3.1, reports).
Our Advantages
- Strong Production Capacity: 10,000 tons/year, advanced equipment.
- Adequate Stock: 600+ tons standard specs (3-7 days delivery); custom specs 15-30 days.
- Custom Processing: One-stop sawing, milling, drilling, polishing, heat treatment.
- Strict Quality Control of 5H12 material: Full-process inspection, professional team/equipment.
- Global Supply: Container/LCL shipment, anti-rust packaging, on-time delivery.
- Professional Technical Support: Senior engineers guide material selection, heat treatment, processing.
FAQ of 5H12 Tool Steel
Q1: What is 5H12 tool steel?
A: 5H12 is a general‑purpose hot‑work tool steel with 5 wt% Cr. Its corresponding Chinese GB grade is 5Cr5MoWVSi. It is a high‑purity premium alloy hot‑work steel, well‑known for outstanding impact toughness and thermal‑fatigue resistance.
Q2: What is the equivalent standard of 5H12 tool steel?
A: 5H12 steel equivalent China GB 5Cr5MoWVSi, US AISI H12, German DIN 1.2605 / X35CrWMoV5, Japanese JIS SKD62.
Q3: What is the chemical composition of 5H12 tool steel?
A: Typical composition of 5H12 material: C: 0.45‑0.55%, Si: 0.80‑1.20%, Mn: 0.20‑1.50%, P: ≤0.030%, S: ≤0.030%, Cr: 4.75‑5.50%, Mo: 1.00‑1.75%, V: 0.40‑0.60%, W: 1.00‑1.50%.
Q4: What are the key properties of 5H12 tool steel?
A: 5H12 delivers high hot strength and hardness. It shows good toughness, thermal‑fatigue resistance and wear resistance at medium‑temperature conditions. It has small heat‑treatment distortion and low scale‑forming tendency during air quenching, plus excellent resistance to molten‑aluminum erosion. Its V content is lower than H13, so it provides better impact toughness.
Q5: What is the hardness of 5H12 tool steel?
A: Annealed (delivery condition) hardness ≤250 HB; some references state ≤229 HB. After quenching at 1020‑1050°C and tempering at 560‑600°C, service hardness ranges 47‑49 HRC. Certain tempering processes can reach 58‑60 HRC.
Q6: What is 5H12 tool steel mainly used for?
A: 5H12 is mainly used for hot extrusion dies, hammer forging dies, press forging dies, precision forging die inserts, and die‑casting dies for aluminum, copper and their alloys. It is also applied to make blades, rolls and other products.
