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Product Details:
Payment & Shipping Terms:
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| Diameter: | 20-450mm | Heat Treatment: | Annealing/Q+T |
|---|---|---|---|
| Test: | SGS/Ut100%/Elements Testing | Technology: | Hot Rolled |
| HS Code: | 7228300000 | ||
| High Light: | carbon tool steel,tool steel flat bar |
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Tool steel Round Bar SAE4140/SCM440 for alloy steel with diameter 20-450mm
Tool steel Round Bar SAE4140/SCM440 for alloy steel with diameter 20-450mm
Chemical composition(%):
| C | Si | Mn | Cr | P | S | Mo |
| 0.38-0.45 | 0.17-0.37 | 0.50-0.80 | 0.90-1.20 | ≤0.035 | ≤0.035 | 0.15-0.25 |
Equivalent grades:
| GB(China) | DIN(German) | AISI(USA) | JIS(Japan) |
| 42CrMo | 1.7225 | SAE4140 | SCM440 |
Available size(mm):
| Flat Bar Size(mm) | Round bar Size(mm) | |||
| Thickness | Width | Length | Diameter | Length |
| 13-280 | 200-2200 | 2000-10000 | 20-260 | 3000-6000 |
Feature:
1. Good strength, hardenability and toughness.
2. High creep strength and long lasting strength under the high temperature.
Appliation:
Production load large, complex shape and valuable tool (e.g, scraper, gear, milling cutter, drilling, tapping, etc.)Cold forging die, forging tools;Strip cutting machine, heading forming die.
Hardness:
Anneal≤217HB
Q+T 28-32HRC
Heat Treatment
1) Forging
Preheat slowly to 750°C then increase temperature more rapidly to 1050-1100°C. Do not forge below 850°C. It is essential to cool slowly after forging, either in a furnace or in vermiculite.
2)Annealing
Soak thoroughly at 840-860°C before furnace cooling at a maximum rate of 20°C per hour down to 600°C
followed by cooling in air. To avoid scaling, box annealing in cast iron chips is preferred.
3)Hardening
Preheat to 780-820°C. Soak thoroughly, then increase rapidly to the hardening temperature of 1000-1030°C. When it has attained this temperature, soak for 20 to 30 minutes. Cool in air. Large sections may be quenched in oil. To reduce scaling or decarburisation, we recommend isothermal molten salt bath treatment. Preheat in salt at 780-820°C then transfer to salt bath standing at 1000-1030°C. Soak and quench into salt standing at 500-550°C. Allow to equalise, withdraw and cool in air. Alternatively, 1.2344 tool steel may be vacuum hardened or pack hardened. Tools should be tempered as soon as they become hand-warm.
4)Tempering
Heat uniformly to the required temperature allowing a soaking time of two hours per 25mm of ruling section. Withdraw from the furnace and allow to cool in air. A second tempering is strongly advised, the tool being allowed to cool to room temperature between tempers. The usual tempering range is 530-650°C depending on the hardness requirements and the operating temperature of the tool.
5)Nitriding
1.2080 tool steel can be nitrided to give a hard surface case. The steel is then very resistant to wear and erosion. Nitriding also increases resistance to corrosion. Nitriding in ammoniac gas at a temperature of 525°C will give a surface hardness approximately 1000 to 1250HV. Before nitriding the tool should be hardened and tempered at approximately 50°C above the nitriding temperature. It is important to note that with increase in penetration of the nitriding, there is a reduction in resistance to thermal shock and an increase in embrittlement.
FAQ:
Q: Are you a manufacturer or merely a trader?
A: We are trading company act as exporting Steel Products with our own factory,
we can manufacture the products as in cutomer's requirement,wholesale and retail all kinds of domestic mould steel,the price we offered is very competitive compared with other agents.
Q: How do you guarantee the quality of your product?
A: Firstly, we can provide the certificates from the third party, such as SGS, CE,ISO if you need. Secondly, we have a complete set of inspection system and every process is checked by QC. Quality is the lifeline of enterprise survival. Third,the products we export are mainly from ShaGang group, WenFeng group, XingCheng group, DongTe group,DaYe and so on, the quality are certained.
Q: Delivery time?
A: We have ready stock for most of material grades in our warehouse. If the material don't have stock, the delivery lead time is about 30-50 days after receiving your prepayment or firm order.
Q: What is the payment term?
A:100% T/T or 30%T/T deposite prepaid, 70%Balance L/C
Q: Can we visit your company and factory?
A: Yes, warmly welcome! We can book the hotel for you before you come to China and arrange our driver to our airport to pick you up when you come.
Product:
Contact Person: Ms. Echo
Tel: +86 18148729336
Fax: +86-020-8251-5866
