I. Base Material

Item	Technical Parameters
Material Grade	303Cu
Chinese National Standard Grade	Y1Cr18Ni9Cu
UNS Grade	-
DIN Grade	-

II. Chemical Composition (Mass Fraction wt%)

C	Si	Mn	P	S	Cr	Ni	Cu
≤0.15	≤1.00	≤3.00	≤0.20	0.15~0.35	17.00~19.00	8.00~10.00	1.50~3.50

III. Mechanical Properties

Item	Mechanical Properties
Tensile Strength Rm	≥500 MPa
0.2% Proof Strength Rp0.2	≥190 MPa
Elongation after Fracture A	≥35%
Brinell Hardness	≤187 HB

IV. Dimensional Tolerance Specifications

Item	Technical Requirements
Common Diameter Range	φ3.0mm ～ φ300mm
Diameter Tolerance	Standard: h8, h9; High Precision: h7, f7, g6, h6
Roundness	≤1/2 diameter tolerance
Straightness	≤0.10mm/1000mm
Standard Length	Φ40mm and below: 3 meters; Over 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

VI. Physical Properties and Surface Quality

Item	Parameter Description
Material Density	7.93 g/cm³
Magnetism	Non-magnetic / Weakly magnetic
Surface Appearance Quality	Free of cracks, peeling, pinholes, oxide scale, rust and impact bruises

VII. Application Scenarios
CNC precision parts, automatic lathe components, high-speed cutting parts, pin shafts, guide shafts, electronic hardware, instrument components, precision structural parts requiring superior machinability and surface finish