9CrSi Cold Work Tool steel
Superior Edge Retention
GB/T 9CrSi’s high carbon and silicon-chromium synergy forms fine carbides, significantly enhancing edge durability. In stainless steel or aluminum machining, it reduces adhesion and extends tool lifespan by over 20%, making it ideal for precision taps and milling cutters.
Versatile Heat Treatment
GB/T 9CrSi supports oil or salt bath quenching, achieving uniform hardness with minimal distortion (<0.05%). Double tempering ensures low residual stress, meeting stringent requirements for complex tool geometries and wire-cutting processes.
Cost-Effective Performance
Compared to high-alloy steels (e.g., SKD11), GB/T 9CrSi reduces material costs by 30% while delivering comparable hardness and wear resistance. It is widely used in small stamping dies, woodworking tools, and gauges, serving industries from automotive parts to general machinery.
- HONGXIN
- DAYE
- 30DAYS
- 8000TONS/MONTH
- Information
GB/T 9CrSi Cold Work Tool Steel
1. GB/T 9CrSi Tool Steel Introduction
GB/T 9CrSi is a high-carbon, low-alloy tool steel under China’s national standard, renowned for its exceptional machinability, wear resistance, and cost efficiency. With a composition of 0.85-0.95% carbon, 1.20-1.60% silicon, and 0.90-1.20% chromium, GB/T 9CrSi achieves a hardness of 60-64 HRC after quenching and tempering. Its low distortion rate and uniform hardening make it ideal for precision tools like taps, drills, and small stamping dies. GB/T 9CrSi is widely adopted in machinery, automotive, and woodworking industries, offering a balance of performance and affordability for medium-duty applications.
| 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. GB/T 9CrSi 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. GB/T 9CrSi Tool Steel Chemical Composition
| Grade | C | Mn | P | S | Si | Cr | Ni | Cu | ||||||
| 9CrSi | 0.85 | 0.95 | 0.30 | 0.60 | 0.03 | 0.03 | 1.20 | 1.60 | 0.95 | 1.25 | ≤0.25 | ≤0.30 | ||
4. GB/T 9CrSi Tool Steel Physical & Mechanical Properties
Physical Properties
| Property | Metric Units | Imperial Units |
|---|---|---|
| Density | 7.85 g/cm³ | 0.283 lb/in³ |
| Melting Point | ~1420°C | ~2590°F |
| Thermal Expansion (20-200°C) | 11.8×10⁻⁶/°C | 6.6 µin/in·°F |
Mechanical Properties
| Property | Metric Units | Imperial Units |
|---|---|---|
| Hardness (Quenched & Tempered) | 60-64 HRC | 60-64 HRC |
| Tensile Strength | 1800-2000 MPa | 261,000-290,000 psi |
| Impact Toughness (Charpy V-notch) | 18-25 J | 13-18 ft-lb |
5. GB/T 9CrSi Tool Steel Heat Treatment
Annealing: Heat GB/T 9CrSi steel to 780-800°C (1436-1472°F), hold for 2 hours, and furnace cool to 500°C at ≤30°C/h. Final hardness: ≤229 HB.
Quenching: Oil or salt bath quench from 820-860°C (1508-1580°F) for uniform hardness.
Tempering: Temper at 180-250°C (356-482°F) for 1-2 hours. Double tempering recommended to achieve 60-64 HRC with minimal residual stress.
6. GB/T 9CrSi Tool Steel Applications
GB/T 9CrSi is widely used in precision machining and medium-load tooling:
Cutting Tools: Taps, drills, milling cutters, and woodworking tools.
Cold Work Dies: Blanking dies, bending molds, and precision punches.
Wear-Resistant Parts: Gauges, fixtures, and guide rails.
Small Stamping Tools: Ideal for thin sheet metal forming.
Why Choose GB/T 9CrSi?
Cost-effective alternative to high-alloy steels like SKD11.
Superior edge retention and machinability for small to medium production batches.
Key Advantages of GB/T 9CrSi Tool Steel
High Machinability: Silicon (Si) reduces tool adhesion during cutting, extending tool life by 20% in stainless steel or aluminum processing.
Thermal Stability: Uniform hardening with oil or salt bath quenching ensures minimal distortion (<0.05%) for complex geometries.
Economic Efficiency: 30% lower cost compared to high-
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.
