Chemical Composition Element Content (wt. %) C 0.95–1.20 Si ≤1.00 Mn ≤1.00 P ≤0.040 S ≤0.030 Cr 16.0–18.0 Ni — Mo ≤0.75 N — Other Fe: Balance

Mechanical Properties Condition Tensile Strength Yield Strength (0.2%) Elongation Hardness Annealed reference ≥760 ≈450 ≥10 ≤269 HB; hardened condition typically 58–60 HRC

Bearings Valve components Wear-resistant parts Precision machinery Cutting and tooling components Specialized mechanical tubing

Chemical Composition Element Content (wt. %) C 0.95–1.20 Si ≤1.00 Mn ≤1.00 P ≤0.040 S ≤0.030 Cr 16.0–18.0 Ni — Mo ≤0.75 N — Other Fe: Balance

Mechanical Properties Condition Tensile Strength Yield Strength (0.2%) Elongation Hardness Annealed reference ≥760 ≈450 ≥10 ≤269 HB; hardened condition typically 58–60 HRC

Bearings Valve components Wear-resistant parts Precision machinery Cutting and tooling components Specialized mechanical tubing

440C Stainless Steel Seamless Pipe

Grade: 440C/S44004 / 9Cr18

Size:

Seamless: 6mm*1mm-720mm*50mm

Coiled: 4mm*0.5mm-32mm*3mm

Standard: ASTM A312, ASTM A213 etc.

Surface: No.1(Pickling), Bright(Polished)

440C Stainless Steel Pipe is a high-carbon martensitic stainless steel developed for high hardness, wear resistance, and moderate corrosion resistance. After suitable heat treatment, the grade can achieve high hardness and excellent resistance to abrasion. It is generally selected for specialized components rather than conventional process piping. Typical applications include bearings, valves, wear-resistant parts, precision components, and cutting or tooling equipment.

Chemical Composition

Element	Content (wt. %)
C	0.95–1.20
Si	≤1.00
Mn	≤1.00
P	≤0.040
S	≤0.030
Cr	16.0–18.0
Ni	—
Mo	≤0.75
N	—
Other	Fe: Balance

Mechanical Properties

Condition	Tensile Strength	Yield Strength (0.2%)	Elongation	Hardness
Annealed reference	≥760	≈450	≥10	≤269 HB; hardened condition typically 58–60 HRC

Bearings
Valve components
Wear-resistant parts
Precision machinery
Cutting and tooling components
Specialized mechanical tubing

Introduction

Specification

Chemical Composition

Element	Content (wt. %)
C	0.95–1.20
Si	≤1.00
Mn	≤1.00
P	≤0.040
S	≤0.030
Cr	16.0–18.0
Ni	—
Mo	≤0.75
N	—
Other	Fe: Balance

Mechanical

Mechanical Properties

Condition	Tensile Strength	Yield Strength (0.2%)	Elongation	Hardness
Annealed reference	≥760	≈450	≥10	≤269 HB; hardened condition typically 58–60 HRC