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Shanghai Bozhong Metal Group Co., Ltd.

Alloy Steel, Carbon Steel, Steel Bar manufacturer / supplier in China, offering Mat. No. 1.7321 Alloy Carbon Steel Bar, Incoloy 825 Alloy Steel Pipe and Tube N08825 2.4858, Stainles Steel Lap Joint Flange and so on.

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Supplier Homepage Product alloy and carbon steel steel bar Mat. No. 1.7321 Alloy Carbon Steel Bar

Mat. No. 1.7321 Alloy Carbon Steel Bar

FOB Price: US $800 / Ton
Min. Order: 1 Ton
Min. Order FOB Price
1 Ton US $800/ Ton
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Port: Shanghai, China
Production Capacity: 2000 Tons/Month
Payment Terms: L/C, T/T, D/P, Western Union, Paypal, Money Gram

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Basic Info
  • Model NO.: 1.7321
  • Standard: AISI, ASTM, GB, JIS, DIN, BS
  • Application: Structural Steel Bar, Tool Steel Bar, Die Steel Bar
  • Alloy: Alloy
  • Trademark: Baosteel
  • Specification: 100kg
  • HS Code: 761090000
  • Type: Carbon Steel Bar
  • Technique: Hot Rolled
  • Surface Treatment: Coated
  • Special Use: Mold Steel, Free Cutting Steel, Cold Heading Steel
  • Transport Package: Standard Seaworthy Package or as The Customer′s Re
  • Origin: China
Product Description
Designation by Standards
Brand NameRavne No.Mat. No.DINENAISI
20MOCR47631.732120MoCr420MoCr4KD8620
Chemical Composition (in weight %)
CSiMnCrMoNiVWOthers
0.20max. 0.400.850.450.45----
Description
One of the most popular and widely used carborizing steels available. 20MoCr4 is a hardenable chromium, molybdenum, nickel low alloy 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. 
Physical properties (avarage values) at ambient temperature
Modulus of elasticity [103 x N/mm2]: 210 
Density [g/cm3]: 7.85
Coefficient of Linear Thermal Expansion 10-6 oC-1
20-100oC20-200oC20-300oC20-400oC20-500oC
11.112.112.712.913.5
Soft Annealing
Heat to 650-700oC, cool slowly. This will produce a maximum Brinell hardness of 207.
Heat Treatment
TreatmentTemperatureCooling
Case hardening880-980oCOil (water), hot bath 160-250oC
Carburising880-980oCOil (water), hot bath 160-250oC
Direct hardening860-900oCOil, hot bath 160-250oC
Core refining860-900oCOil, hot bath 160-250oC
Core refining780-820oCOil, hot bath 160-250oC
Tempering150-200oCAir
Hardenability Diagram

Click the image to enlarge the 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. 
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