100mm alloy steel round bar 4140 SCM440 4340 42CrMoA

100mm alloy steel round bar 4140 SCM440 4340 42CrMoA

Products Description                                                                                                      

Products Show                                                                                                                 

Production Workshop                                                                                                     

Fabrication and Heat Treatment                                                                                     

1. Forging

Preheat the steel carefully, then raise the temperature to 1150-1200°C for forging. Do not forge below 850°C.

2. Annealing

Heat the AISI 4140 slowly to 800-850°C and allow enough time for the steel to be thoroughly heated. Cool slowly in the furnace to 480°C followed by air cooling.

3. Stress Relieving

When parts are heavily machined, ground or otherwise subject to cold work, stress relieving will be beneficial prior to hardening.

4. Hardening

AISI 4140 steel is usually supplied ready heat treated to 18-22HRC. If further heat treatment is required annealed AISI 4140 should be heated slowly to 840-875°C and after adequate soaking at this temperature quench in oil. Temper as soon as the tools reach room temperature.

5. Tempering

Heat the AISI 4140 carefully to a suitable temperature selected by reference to a tempering chart or table (usually between 550-700°C, soak at the temperature for 2 hours per 25mm of ruling section, then allow to cool in air. Tempering between 250-375°C is not advised as tempering within this range will seriously reduce the impact value.

6. Surface Treatment

Plate: Origin Black, Orign cold rolled bright, Machined, Grinded

Bar: Origin Black, Orign cold rolled(drawn) bright, Turned, Peeled, Grinded

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Product Certificate                                                                                                           

About Us                                                                                                                           

Tianjin Yichengtong Steel Trade Co., Ltd is a comprehensive company, who is founded in 2008.
Specialized in stainless steel products, seamless steel pipe, welded steel pipe,steel coil and
plates. 

Our company acts as a perennial distributor of seamless steel pipes, stainless steel pipes and alloy pipes for Tianjin Seamless Steel Tube Plant, Chengdu Pangang Group, Baotou Steel Pipe Plant, Daye Steel Plant, Baoshan Steel Pipe Plant and other major steel plants. Stainless steel plate and coils for TISCO BAO STEELJISCOZPSSLISCO, etc.

FAQ                                                                                                                                   

Q: What is the minimum order quantity?
A: 1ton.

Q: What is delivery time?
A: 5 days after deposit. Except for public holidays.

Q: How can you guarantee the quality?
A: We have rigorous quality test system, from raw materials to finished products, the materials
     must be checked and signed  by QC people.

Q: How long can I get a quote?
A: The quotation can be provided not longer than 24 hours on condition that we know all detailed

     requirements.

Q: Can I get a sample?
A: Yes we offer free samples. Delivery cost is to be paid by clients.

Q: Can you provide OEM service?
A: Yes,we can produce under your own brandname. Logo and design need to be provided so as
     to make customized brandname.

Q: Why can I trust you and place order with you?
 A: From 2008 to 2019 TJYCT is with 12 years experience in this industry, we have served clients
     from more than 100 countries, TJYCT is well-known for its quality and TJYCT team win clients'
     trust by honesty and down to earth business style.  

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