The material 20Cr2Ni4A is a kind of structural alloy steel. 20 cr2ni4a is high quality alloy steel and it has high strength,toughness and hardenability.For 20Cr2Ni4A steel, there is no direct quenching after carburizing in order to reduce surface residual austenite. 20Ci2Ni4A’s cutting and cold deformation plasticity is general and it has poor weldability.
20 Cr2Ni4A is widely used for large cross-section carburized parts, such as large gear, shaft, and conditioning components requiring high strength, and good toughness.
20Cr2Ni4A chemical composition %:
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20Cr2Ni4A mechanical properties:
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||Notched bar impact strength
20Cr2Ni4A condition of delivery: heat treatment(Normalizing, Annealing, or high temperature tempering) or do not heat treatment state.
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20Cr2Ni4A | 20Cr2Ni4A process | 20Cr2Ni4A heat treatment process
Update: 2015/3/18View: 1278
- Title: 20Cr2Ni4A | 20Cr2Ni4A process | 20Cr2Ni4A heat treatment process
- Mark: 20Cr2Ni4A
- Specification: Complete specifications
- Memo: 20Cr2Ni4A
- Price: RMB
- Promotion: RMB ( 0 Customers Bought)
Product Name: Alloy structural steel
Digital Code: A43202
Steel Group Series: CrNiA
Implementation of the standards: GB / T3077-1999
Delivery status: hot-rolled or annealed, the specific delivery status should be indicated in the warranty book.
Steel: Xining Special Steel, Dongbei Special Steel, Chongqing Special Steel.
20Cr2Ni4A carburizing steel for high-strength alloy steel, with good mechanical properties, hardenability, strength and toughness are more than 12CrMi3 steel. 20Cr2Ni4A forging good performance, forging heating temperature of 1200 ℃, initial forging temperature of 1150 ℃, final forging temperature higher than 850 ℃, slow cooling after forging.
20Cr2Ni4A chemical composition range of values:
Note: The actual chemical composition of the steel quality books to prevail.
20Cr2Ni4A Carbon C: 0.17 ~ 0.23
20Cr2Ni4A Si Si: 0.17 ~ 0.37
20Cr2Ni4A Manganese Mn: 0.30 ~ 0.60
20Cr2Ni4A sulfur S0.035
20Cr2Ni4A phosphorus P0.035
20Cr2Ni4A chromium Cr: 1.25 ~ 1.65
20Cr2Ni4A Ni Ni: 3.25 ~ 3.65
20Cr2Ni4A copper Cu0.030
20Cr2Ni4A mechanical properties of a range of values:
Note: The actual mechanical properties of the steel quality books to prevail.
Tensile strength b (MPa)1175
Yield strength s (MPa)1080
Elongation 5 (%)10
Section shrinkage (%)45
Impact energy Akv (J)63
Impact toughness kv (J / cm2)78
Sample size: Sample size is 18mm rough
20Cr2Ni4A heat treatment process:
Quenching temperature: the first heating 880 ℃; the second heat 780 ℃; coolant: Oil
Tempering heating temperature: 200 ℃; Coolant: water, air
For the manufacture of small and medium sized cars, tractor engine and transmission in gear, manufacture of high performance core part of carburized parts, cyanide parts, such as oil drilling and metallurgical open pit with claws and teeth cone body.
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