JIS SKD5 Hot Worked Tool Steel
Superior Thermal Fatigue Resistance
SKD5’s chromium-molybdenum matrix ensures 30% longer service life than H13 in cyclic thermal environments (e.g., aluminum die-casting). Its retained hardness (≥45 HRC at 600°C) minimizes cracking and deformation under repeated heating-cooling cycles.
Precision Machinability & Surface Finish
In the annealed state (≤229 HB), the steel exhibits excellent grindability and polishability, achieving mirror-like surfaces for high-gloss plastic molds. Minimal distortion during heat treatment ensures dimensional accuracy for complex geometries.
Versatile Industrial Adaptability
From automotive forging dies to aerospace turbine molds, SKD5 adapts to diverse high-temperature applications. Its cost-effective performance and extended tool lifespan reduce production downtime, making it a top choice for manufacturers.
- HONGXIN
- 中国
- 30DAYS
- 8000TONS/MONTH
- Information
JIS SKD5 Hot Worked Tool Steel
1. JIS SKD5 Hot Work Tool Steel Overview
JIS SKD5 is a high-performance hot work tool steel renowned for its exceptional thermal fatigue resistance and toughness. With a composition of 0.32-0.42% carbon, 4.80-5.50% chromium, and 1.20-1.50% molybdenum, it achieves a hardness of 48-52 HRC after heat treatment. Its ability to retain hardness at 600°C makes it ideal for aluminum die-casting molds, forging dies, and aerospace components. Widely used in automotive, metalworking, and heavy machinery industries, SKD5 combines durability with cost-effectiveness for extreme thermal cycling environments.
| 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 per customers request. | ||
| Delivery time | 30-45 days | ||
2. JIS SKD5 Tool Steel Supply Range
| Size | Round | Dia 12-500mm |
| Plate/Flat/Block | Thickness 8mm-300mm | |
| Width 210mm-710mm | ||
| Process | EAF+LF+VD+Forged+Heat treatment(optional) |
3. AISI O1 Tool Steel Chemical Composition & Global Equivalents
| Grade | C | Si | Mn | P | S | Cr | W | V |
| H21/T20821 | 0.26~0.36 | 0.15~0.50 | 0.15~0.40 | ≤0.030 | ≤0.030 | 3.00~3.75 | 8.50~10.0 | 0.30~0.60 |
| 1.2581/ X30WCrV9-3 | 0.25~0.35 | 0.15~0.30 | 0.20~0.40 | ≤0.035 | ≤0.030 | 2.50~2.80 | 8.00~9.00 | 0.30~0.40 |
| 3Cr2W8V | 0.30~0.40 | ≤0.40 | ≤0.40 | ≤0.030 | ≤0.030 | 2.20~2.70 | 7.50~9.00 | 0.20~0.50 |
| SKD5 | 0.25~0.35 | 0.10~0.40 | 0.15~0.45 | 0.030 | ≤0.030 | 2.50~3.20 | 8.50~9.50 | 0.30~0.50 |
4. JIS SKD5 Tool Steel Physical & Mechanical Properties
Physical Properties
| Property | Metric Units |
|---|---|
| Density | 7.85 g/cm³ |
| Thermal Conductivity | 32.0 W/m·K (20°C) |
| Linear Thermal Expansion (20-260°C) | 10.6 μm/m·K |
Mechanical Properties
| Property | Metric Units |
|---|---|
| Hardness (Quenched & Tempered) | 57-63 HRC |
| Tensile Strength | 1690 MPa |
| Yield Strength | 1500 MPa |
| Impact Toughness | Moderate |
5. JIS SKD5 Tool Steel Heat Treatment
Annealing
Heat to 885C, later cool in heat treatment at not quite 4C per hour. After annealing Hardness 235 HBS Max.
Hardening and Quenching
Quenching | salt bath furnace: 1177 / ℃
Quenching | controlled atmosphere furnace: 1191 / ℃
Heat preservation time: 5 ~ 15 mins
Quenching medium: air cooling
Tempering
Tempering temperature / ℃ : 552
After tempering hardness HRC or higher: 52
6. JIS SKD5 Tool Steel Applications
SKD5 excels in high-temperature industrial processes:
Hot Work Dies: Aluminum/copper die-casting molds, forging dies, extrusion tooling.
Plastic Molds: High-gloss injection molds requiring thermal stability.
Aerospace & Automotive: Turbine blade molds, engine component dies.
Why Choose SKD5?
Thermal Fatigue Resistance: 30% longer lifespan than H13 in cyclic thermal loads.
Dimensional Stability: Minimal distortion during heat treatment ensures precision.
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.
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.
