I. Basic Material

Item	Technical Parameters
Material Grade	420
Chinese National Standard Grade	2Cr13
UNS Grade	S42000
DIN Grade	1.4028

II. Chemical Composition (Mass Fraction wt%)

C	Si	Mn	P	S	Cr
0.16～0.25	≤1.00	≤1.00	≤0.040	≤0.030	12.00～14.00

III. Mechanical Properties

Item	Mechanical Properties
Tensile Strength Rm	≥640 MPa
0.2% Proof Strength Rp0.2	≥440 MPa
Elongation after Fracture A	≥20%
Brinell Hardness	≤241 HB

IV. Dimensional Accuracy Specifications

Item	Technical Requirements
Common Diameter Range	φ3.0mm ～ φ300mm
Diameter Tolerance	Standard: h8, h9; High Precision: h7, f7, g6, h6
Roundness	≤1/2 of diameter tolerance
Straightness	≤0.10mm/1000mm
Standard Length	φ40mm and below: 3 meters; Above φ40mm: 6 meters available (custom fixed lengths supported)
End Face Requirements	Flat ends, chamfered and deburred

V. Processing Technology & Surface Roughness

Process Type	Complete Process Flow	Surface Roughness
Process 1	Hot Rolled Base Material → Precision Drawing → Centerless Precision Grinding	Ra 0.4～0.8μm
Process 2	Hot Rolled Base Material → Peeling & Straightening → Centerless Precision Grinding	Ra 0.4～0.8μm
Process 3	Hot Rolled Base Material → Peeling & Straightening → Centerless Precision Grinding → Polishing	Ra ≤0.2μm
Process 4	Hot Rolled Base Material → Quenching and Tempering → Peeling & Straightening → Centerless Precision Grinding → Polishing	Ra ≤0.2μm
Process 5	Hot Rolled Base Material → Peeling & Straightening → Surface Hardening → Centerless Precision Grinding → Polishing	Ra ≤0.2μm

VI. Physical Properties and Surface Quality

Item	Parameter Description
Material Density	7.75 g/cm³
Magnetism	Magnetic
Appearance Quality	Free of cracks, peeling, blowholes, scale, rust and impact bruises

VII. Application Scenarios
Cutting tools, bearings, valves, pump shafts, medical device components, wear-resistant precision shafts, food machinery, rust-proof and wear-resistant structural parts.