Doğrulanmış işletme lisanslarına sahip tedarikçiler
Denetlenen Tedarikçi | Product Name | JIS standard forged 4340 alloy steel round bar |
| Material | 4140,42CrMo,15CrMo,EN19,etc |
| Diameter | 10mm~900mm |
| Length | 3m, 6m, 9m, 12m or as requst |
| Tolerance | -0/+1.0 mm (dia), -0/+5.0 mm (length) |
| Technique | Cold/Hot rolled, Cold-Drawn or Hot Forged |
| Test | SGS/UT100%/Elements Testing |
| Standard |
ASTM A516,A572,A285,A299, EN10025, DIN17100,17102, JIS G3101,G3106, GB/T700 |
| Surface | Black, Peel, Polished, Pickling,etc |
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
Δ Products Inspection
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 2022 TJYCT is with 15 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.
Doğrulanmış işletme lisanslarına sahip tedarikçiler
Denetlenen Tedarikçi 
