I. Base Material

Item	Technical Parameter
Material Grade	2507
Chinese National Standard Grade	022Cr25Ni7Mo4N
UNS Grade	S32750
DIN Grade	1.4410

II. Chemical Composition (Mass Fraction wt%)

C	Si	Mn	P	S	Cr	Ni	Mo	N
≤0.030	≤1.00	≤1.20	≤0.035	≤0.020	24.00～26.00	6.00～8.00	3.00～5.00	0.24～0.32

III. Mechanical Properties

Item	Mechanical Property
Tensile Strength Rm	≥800 MPa
Yield Strength Rp0.2	≥550 MPa
Elongation after Fracture A	≥15%
Brinell Hardness	≤310 HB

IV. Dimensional Accuracy Specifications

Item	Technical Requirements
Common Diameter Range	φ3.0mm ～ φ300mm
Diameter Tolerance	Conventional: 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 and straightening → Centerless precision grinding	Ra 0.4～0.8μm
Process 3	Hot rolled base material → Peeling and straightening → Centerless precision grinding → Polishing	Ra ≤0.2μm

VI. Physical Properties and Surface Quality

Item	Parameter Description
Material Density	7.80 g/cm³
Magnetism	Magnetic (duplex microstructure)
Surface Appearance Quality	Free of cracks, peeling, pinholes, scale, rust and collision dents

VII. Application Scenarios
Seawater desalination, marine engineering, oil & gas desulfurization, high-chloride corrosive chemical environments, high-strength corrosion-resistant valve stems, high-pressure piston rods, special anti-corrosion precision shaft components.