Steel S20c

S20C is a kind of steel, which belongs to low carbon carbon steel.

Chinese name S20C

standard JIS G4051-2005

strength than 15 steel slightly higher

cold deformation plasticity

Executive standard
JIS G4051-2005

Characteristic application range

S20C strength is slightly higher than 15 steel, rarely quenched, no tempering brittleness. High cold deformation plasticity, generally for bending, calendering, bending and hammer arch and other processing, arc welding and contact welding performance is good, gas welding thickness is small, strict shape requirements or complex shape of the workpiece prone to crack. The machinability of cold drawing or normalizing state is better than annealing state, S20C is used to manufacture parts with little force and high toughness requirements.

peculiarity

Cold extruded, carburized hardened steel. The steel belongs to low-carbon carbon steel, the steel has low strength, good toughness, plasticity and weldability. Yield strength ≥245MPa, tensile strength ≥402MPa, elongation ≥28%. Normalizing can promote spheroidization of structure, refine large block proeutectoid ferrite, and improve cutting performance of blank less than 160HBS.

Supply status
Unheat treated state.

Chemical composition

(Mass fraction, %) C 0.18-0.23, Si 0.15-0.35, Mn 0.30-0.60, P≤0.030, S≤0.035.

Refer to the corresponding steel number

The standard steel number of GB/JB in China is 20, the Taiwan CNS standard steel number S20C, the German DIN standard material number 1.0402, the German DIN standard steel number CK22/C22, the British BS standard steel number IC22, the French AFNOR standard steel number CC20, the French NF standard steel number C22, the Italian UNI standard steel number C 20/C21, Belgium NBN standard steel C25-1, Sweden SS standard steel 1450, Spain UNE standard steel F.112, United States AISI/SAE standard steel 1020, Japan JIS standard steel S20C/S22C

Phase transition point temperature

(Approximate value) Ac1=720-845℃, Ar1=815-730℃

Processing specification

Temperature 700-720℃, holding time 8-15h, with a cooling speed of 50-100℃/h, reduce the temperature ≤550-600℃, air cooling.

Hardness ≤143HBS before treatment, hardness ≤131HBS after treatment.

Normalizing specification
Temperature 870-920℃, oven air cooling.

Annealing specification
The temperature is about 860℃, and the oven is air-cooled.

Quenching specification
Temperature 910℃±10℃, 10%NaCl brine cooling.

Performance and application

The strength is slightly higher than S15C steel, good weldability, no tempering brittleness, and machinability can be improved by water quenching.

use

It is used to manufacture various mechanical parts that are not subjected to great stress and require high toughness. It is used in general machinery, automobiles and agricultural machinery to manufacture carburizing and carbonitriding parts with high surface hardness requirements and small core requirements.

Major difference

Chinese GB/JB label: 20 Japanese JIS label: S20C/S22C American AISI label. Delivery condition: Delivered in a condition of no heat treatment or heat treatment (annealing, normalizing or high temperature tempering). Where delivery in heat treatment condition is required, it shall be indicated in the contract, and if not indicated, delivery shall be made without heat treatment.

7. Hardness ≤143HBS before treatment, hardness ≤131HBS after treatment.

China GB/JB label: 20 Japanese JIS label: S20C/S22C American AISI label: 1020 German DIN Steel label: CK22/C22 German DIN Material label: 1.0402 Taiwan CNS label: S20C British BS label: IC22 French AFNOR label: CC20 Italian UNI Label: C20/C21 Chemical composition: C Carbon: 0.18 ~ 0.23Si Silicon: 0.15 ~ 0.35Mn Manganese: 0.30 ~ 0.60S Sulfur: ≤ 0.030P Phosphorus: ≤ 0.030Cr Chromium: ≤ 0.25Ni Nickel: ≤ 0.20Cu Copper: ≤ 0.30

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