Chemical Composition Element Content (wt. %) C ≤0.090 Si ≤1.00 Mn ≤1.00 P ≤0.040 S ≤0.030 Cr 16.0–18.0 Ni 6.5–7.75 Mo — N — Other Al: 0.75–1.50; Fe: Balance

Mechanical Properties Condition Tensile Strength Yield Strength (0.2%) Elongation Hardness Condition A, reference ≈965 ≈380 ≥20 ≈≤255 HB

Aerospace components Springs and spring tubing Diaphragms Pressure components Chemical equipment Specialized mechanical systems

Chemical Composition Element Content (wt. %) C ≤0.090 Si ≤1.00 Mn ≤1.00 P ≤0.040 S ≤0.030 Cr 16.0–18.0 Ni 6.5–7.75 Mo — N — Other Al: 0.75–1.50; Fe: Balance

Mechanical Properties Condition Tensile Strength Yield Strength (0.2%) Elongation Hardness Condition A, reference ≈965 ≈380 ≥20 ≈≤255 HB

Aerospace components Springs and spring tubing Diaphragms Pressure components Chemical equipment Specialized mechanical systems

631 Stainless Steel Seamless Pipe

Grade: 631/17-7PH/S17700

Size:

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

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

Standard: ASTM A312, ASTM A213 etc.

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

631 Stainless Steel Pipe, commonly known as 17-7PH, is a precipitation-hardening stainless steel designed to provide high strength, good corrosion resistance, and useful spring properties. Its mechanical performance can be tailored through conditioning and aging treatments. The grade is used in aerospace structures, springs, diaphragms, pressure components, chemical equipment, and specialized mechanical systems where high strength and corrosion resistance are required.

Chemical Composition