JIS SKT4 Cold Worked Tool Steel
Superior Impact Resistance
JIS SKT4’s high nickel content (1.40-1.80%) delivers exceptional toughness, enabling it to withstand heavy shock loads without cracking. This makes it ideal for tools like blanking dies and chisels, where impact resistance is critical.
Balanced Performance for Cold Work
The steel’s optimized chromium (0.80-1.20%) and molybdenum (0.20-0.30%) content ensures adequate wear resistance while maintaining toughness. This balance allows SKT4 to perform reliably in medium-duty cold work applications such as forming molds and guide rails.
Economic Efficiency
Compared to high-alloy steels like SKD11, SKT4 provides a cost-effective alternative for manufacturers. Its machinability in the annealed state (≤229 HB) reduces production costs, making it ideal for small-to-medium production batches requiring both performance and affordability.
- HONGXIN
- 中国
- 30DAYS
- 8000TONS/MONTH
- Information
JIS SKT4 Tool Steel Overview
1. JIS SKT4 Tool Steel Introduction
JIS SKT4 is a high-toughness cold work tool steel under the Japanese JIS standard, renowned for its balanced performance in demanding industrial environments. With a composition of 0.45-0.55% carbon, 1.40-1.80% nickel, and 0.80-1.20% chromium, it achieves a hardness of 52-56 HRC after heat treatment. Its exceptional impact resistance and moderate wear resistance make it ideal for heavy-duty applications such as blanking dies, shear blades, and automotive stamping tools. Widely adopted in manufacturing and metalworking industries, SKT4 offers a cost-effective solution for applications requiring durability and reliability under high-stress conditions.
| Heat treatment | Normalized ; Annealed ; Quenched ; Tempered | ||
| Surface condition | Black; Peeled; Polished; Machined; Grinded; Turned; Milled | ||
| Delivery condition | Forged; Hot rolled; Cold drawn | ||
| Test | Tensile strength, Yield strength, elongation, area of reduction, impact value, hardness, grain size, ultrasonic test, US inspection, magnetic particle testing, etc. | ||
| Payment terms | T/T;L/C;/Money gram/ Paypal | ||
| Trade terms | FOB; CIF; C&F; etc.. | ||
| Packing | Standard Packages, or as Customers Request | ||
| Delivery time | 30-45 days | ||
2. JIS SKT4 Tool Steel Supply Range
| Size | Round | Dia12-500mm | |
| Plate/Flat/Block | Thickness 8mm-300mm | ||
| Width 210mm-710mm | |||
| Process | EAF+LF+VD+Forged+Heat treatment(optional) | ||
3. JIS SKT4 Tool Steel Chemical Composition & Global Equivalents
| Country | China | Japan | Germany | USA | UK |
| Standard | GB/T 1299 | JIS G4404 | DIN EN ISO4957 | ASTM A681 | BS 4659 |
| Grade | 5CrNiMo | SKT4 | 1.2713 | L6/T61206 | BH224/5 |
| C | Si | Mn | P | S | Cr | Mo | W | V | Co | Ni |
|---|---|---|---|---|---|---|---|---|---|---|
| 0,50-0,60 | 0,15-0,40 | 0,50-0,80 | Max 0,030 | Max 0,030 | 0,50-0,80 | 0,15-0,25 | - | - | - | 1,40-1,80 |
4. JIS SKT4 Tool Steel Physical & Mechanical Properties
Physical Properties
| Property | Metric Units |
|---|---|
| Density | 7.85 g/cm³ |
| Thermal Expansion (20-100°C) | 11.8×10⁻⁶/°C |
| Thermal Conductivity | 32 W/(m·K) |
Mechanical Properties
| Property | Metric Units |
|---|---|
| Hardness (Quenched & Tempered) | 52-56 HRC |
| Tensile Strength | 1800-2000 MPa |
| Impact Toughness (Charpy) | 25-35 J |
Thermal Stability: Maintains hardness up to 400°C.
5. JIS SKT4 Tool Steel Heat Treatment
Soft Annealing
Heat to 670-700oC, cool slowly in furnace. This will produce a maximum Brinell hardness of 250.
Stress Relieving
Stress relieving to remove machining stresses should be carried out by heating to approx. 650oC, holding for 1-2 hours at heat, followed by air cooling. This operation is performed to reduce distortion during heat treatment.
Hardening
Harden from a temperature of 830-870oC followed by oil quenching. Hardness after quenching is 57-61 HRC.
Tempering
Tempering temperature: 400-700oC.
6. JIS SKT4 Tool Steel Applications
JIS SKT4 excels in heavy-duty cold work applications:
Cold Work Dies: Blanking dies, forming tools, and bending molds.
Cutting Tools: Shear blades, punches, and chisels.
Industrial Components: Guide rails, wear plates, and high-stress fixtures.
Automotive: Stamping dies for high-strength steel sheets.
Why Choose SKT4?
Impact Resistance: Superior toughness for high-stress environments.
Cost Efficiency: More economical than high-alloy steels for medium-duty applications.
7. Delivery condition
For hot forged or hot rolled bar, usually the delivery condition is hot forged or rolled, annealed, rough turned.
For hot forged plate, usually the delivery condition is hot forged, annealed, milled surface.
For hot rolled plate, usually the delivery condition is hot rolled, annealed, black surface.
Hongxin Mold Tech Co.,Ltd. owns 1 set of Hot Rolling Production Line at size range flats 8-80*210-710mm, rounds 16-50mm Dia.
12 sets of Hydraulic Forging Hammers from Power 560kgs to 6000kgs which could cover flats 40-300*210-710mm.
8 sets of EF+LF+VD
5 sets of ESR
9 sets of Milling Machines
10 sets of Turning Lathes
6 sets of Precision Milling Machines.
CERTIFICATION: GB/T19001-2016/ISO9001:2015
Products' List
Q1:Are you trading company or manufacturer ?
We are the biggest tool steel factory at Daye & Huangshi. We can provide a wide range of steel products.
Q2:What is alloy steel round bar export packing?
Usually bundling for large diameter,small diameter bars in bulk or as customer's demand.
Q3.What is your MOQ?
We accept small order,if it is stock,any quantities can be accepted.
Q4.What is your lead time?
Depends actual order,around 20-35 days,or negotiation.
Q5.Can you supply sample?
Yes,we can.Sample fee according to your size.
Q6:What certificates do you have?
ISO, ABS, BV, CCS, Dnv, Lr, Gl, Mill Certificate
Q7: How can I get your quotation as soon as possible?
The email and fax will be checked within 24 hours,meanwhile,the Skype,Wechat and WhatsApp will be online in 24 hours.Please send us your requirement,we will work out a best price soon.
