SHANGHAI UNITE STEEL
One-stop Brand Service Provider For Globle Machinery And Petrochemical Enterprise And Special Steel Distributor.
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INTRODUCTION
One of the most popular and widely used carborizing steels available. 20MoCr4 is a hardenable chromium, molybdenum, nickel low steelalloy steel often used for carburizing to develop a case-hardened part. This case-hardening will result in good wear characteristics.
APPLICATIONS
Gears, shafts and other applications where a hard carborized case and a tough core are desired.
-Dimension: Diameter 4-1600 mm, any length below 16 meters
-Delivery Conditions:
Cold drawn: 4-100 mm
Peeled: 30-160 mm
Grinded: 4- 600 mm
Turned: 130-1200 mm
Hot rolled: 12-320 mm
Hot forged: 130-1600 mm
-EAF+(ESR) or EAF+LF+VD+(ESR)
-HOT rolled; Cold rolled; Forged; Cold Drawn
-Heat Treatment: Untreated, Annealing, N+T, Q+T
-Smelting: EAF+LF+VD (+ESR)
-Surface Finish: Black, Rough Machined, Peeled, Turned or upon request
-UT 100% passed
-Cutting service provided
-Third Party inspection is acceptable (SGS, BV etc.)
Standard
ASTM A213; ASTM A335; ASTM A519; ASTM A106; ASTM A29; JIS G3462; JIS G3458; JIS G3444; JIS G4053; DIN17175; DIN1629; DIN2391; GB/9948, GB/6479; GB/T8162; GB/T8163; GB/T 3077; EN 10297; EN 10084; EN 10083; ISO 683/11; IOS 683/10; IOS 683/1; etc.
Chemical Requirements, Composition, %
| C | Si | Mn | P | S | Cr | Mo |
| 0.17-0.23 | max 0.4 | 0.7-1.0 | max 0.035 | max 0.035 | 0.3-0.6 | 0.4-0.5 |
20CrMo4 - General Mechanical Properties
| Yield Rp0.2 (MPa) | Tensile Rm (MPa) | Impact KV/Ku (J) | Elongation A (%) | Reduction in cross section on fracture Z (%) | As-Heat-Treated Condition | Brinell hardness (HBW) |
|---|---|---|---|---|---|---|
| 481 (≥) | 945 (≥) | 33 | 11 | 11 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 443 |
Quality Assurance
Below inspection will be done in the production.
(1) ray detection---RT;
(2) ultrasonic testing---UT;
(3) Magnetic Particle Testing-MT;
(4) penetration testing-PT;
(5) eddy current flaw detection-ET
PROCESSING
Soft Annealing
Heat to 650-700oC, cool slowly. This will produce a maximum Brinell hardness of 207.
Heat Treatment
| Treatment | Temperature | Cooling |
| Case hardening | 880-980oC | Oil (water), hot bath 160-250oC |
| Carburising | 880-980oC | Oil (water), hot bath 160-250oC |
| Direct hardening | 860-900oC | Oil, hot bath 160-250oC |
| Core refining | 860-900oC | Oil, hot bath 160-250oC |
| Core refining | 780-820oC | Oil, hot bath 160-250oC |
| Tempering | 150-200oC | Air |
Hardenability Diagram
Forging
Hot forming temperature: 1050-850oC.
Machinability
Machining is done prior to carburizing to within as close a tolerance as possible. Finish machining, after heat treatment and/or carburizing, should be at a minimum so as not to impair the hardened case of the part. Machining may be done by conventional means prior to heat treatment - after carburizing machining is usually limited to grinding.
Welding
The alloy may be welded by conventional methods, usually gas or arc welding. Preheating at 200oC is beneficial and subsequent heating after welding is recommended - consult the approved weld procedure for the method used.
Cold working
The alloy may be cold worked in the annealed condition by conventional methods. Cold working, as with machining, should be done to as close a tolerance as possible before heat treatment or carburizing.
What we can offer?
-We offer a wide range of steel products in a wide variety of dimensions and executions, according to the common international specifications or customize.
-Machining and heat treatment are available.
-Also, we advise you in choosing the right materials.
Shape Available
Our Advantages
OUR MAIN PRODUCTS ARE LISTED AS BELOW
Notes:
Available Size:
-Round: Dia. 4 -1600 mm
-Flat: T. 10-120 mm x W. 60-810 mm
-Block: T. 80-1200 mm x W. 100-1600 mm
PAYMENT AND SHIPPING
1. Both T/T and L/C will be acceptable
2. Trade Terms: FOB, CIF, CFR
3. The delivery will be in 10-15 days if have stock; For customized items, the delivery will be negotiated by both parties
4. Shipping by sea freight from Shanghai Port (PRC) for Bulk orders, by airfreight or express for samples
COMPANY INFORMATION
Shanghai Unite Steel Trading Co., Ltd
We are committed to integrate engineering steel resources in china and serve the global engineering steel market. Our company has more than 15 years of experience in steel researching, production, managing and sales. And our team mostly are based on and worked in national famous steel enterprise.
In the aspect of resources and information, we have established cooperative and stronger relationship with nearly hundred enterprises, either state-owned or private owned in china.
What’s more, we have built long, deep and close business relationship with dozens of steel company, Sharing and holding equities with several steel enterprises. Because of the close cooperation with steel companies and our pioneering spirit, which can ensure us stay at the top competition, and ensure our customers get what they really want!
FAQ
Q: Are you a manufacturer or merely a trader?
A: We are group of companies and owned manufacturer bases and trading company. We specialized in special steel which include alloy structural steel and carbon steel and stainless steel, etc. All material are with high quality and competitive price.
Q: How do you guarantee the quality of your product?
A: Firstly, we can provide the certificates from the third party, such as TUV, CE, 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.
Q: Delivery time?
A: We have ready stock for most of material grades in our warehouse. If the material doesn't have stock, the delivery lead time is about 5-30 days after receiving your prepayment or firm order.
Q: What is the payment term?
A: T/T or 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.
CONTACT US
We are happy to answer your questions and make you an offer for these and other materials. Contact us now for more information.
Your Contact Person
Ms Chilli Ho
Phone/Wechat/Whatsapp +86-181-0187-5575
Skype: chilli.ho@outlook.com
Email: chilli.ho@shunitesteel.com