What is 17 7PH stainless steel equivalent to?

Altemp Alloys carries a variety of stainless steels with the ability to withstand high temperatures. Of the most frequently used in the the aerospace industry and when meticulous, elaborate parts are needed, 17-7 PH stainless steel is a common choice.

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A stable, chromium-nickel-aluminum steel, 17-7 is a precipitation hardening steel with a high strength and moderately resistant to corrosion. In terms of corrosion resistance, 17-7 PH stainless steel is comparable to 304 stainless steel and a better choice when compared to the 400 series of stainless steel. 17-7 from Altemp is specified to AMS , , & ASTM A 564, 693. 

Stainless steel 17-7PH, AISI 631, 1., X7CrNiAl17-7 and UNS S age hardened in accordance with ASTM A693, A313, A564, A705, EN .

 

Standard Steel Grade Chemical composition % C: Mn: Si: P: S: Cr: Ni: Al: ASTM 17-7PH - 17-7 PH <0.09 <1.0 <0.5 <0.025 <0.025 16.00 - 17.25 6.50 - 7.75 0.75 - 1.25 UNS S - AMS / - AMS - AMS <0.09 <1.0 <1.0 <0.040 <0.030 16.0 - 18.0 6.5 - 7.7 0.75 - 1.50 EN X7CrNiAl17-7 - 1. <0.09 <1.0 <0.7 <0.040 <0.015 16.0 - 18.0 6.5 - 8.3 0.7 - 1.5 SUS SUS 631 <0.09 <1.0 <1.0 <0.040 <0.030 16.00 - 18.00 6.50 - 7.75 0.75 - 1.50

 

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17-7PH, AISI 631, X7CrNiAl17-7, 1. - specification and application

Stainless steel from the group of age-hardened PH with the highest content of Chromium - 17% and Nickel - 7% in relation to PH of grades 15-5 and 17-4. It has excellent strength properties, high hardness and elasticity, good corrosion resistance and resistance to high temperatures and deformation. 

In terms of chemical composition, the corrosion resistance equals that of AISI 301 / 1. steel, in terms of mechanical properties it is a much better choice for responsible parts and components exposed to fatigue. In the annealed state, the steel has an austenitic structure, after heat treatment of ageing it turns into martensite, increasing its strength properties along with obtaining magnetic properties.

The material is used on valve parts, tanks, springs, spring washers, food knives, diaphragms, low and high temperature parts, heat exchangers, special fittings and installations, machine constructions and components. Steel is intended for the aerospace, petroleum, chemical and petrochemical industries, energy, food and cryogenic industry in the form of strips, wires, sheets and bars.

 

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17-7PH, S according to ASTM A - mechanical properties

• Annealed condition, saturated - Cond A
  • Rm: > MPa
  • Rp0,2: >380 MPa
  • Elongation, A: >20%
  • Hardness: <92 HRB
• Hardened condition after ageing - Cond TH
  • Rm: > MPa
  • Rp0,2: >965 MPa
  • Elongation, A: >6%
  • Necking, Z: >25%
  • Hardness: >38 HRC / >352 HB
• Hardened condition after ageing - Cond RH950
  • Rm: > MPa
  • Rp0,2: > MPa
  • Elongation, A: >6%
  • Necking, Z: >10%
  • Hardness: >41 HRC / >388 HB
• Condition after cold rolling - Cond C
  • Rm: > MPa
  • Rp0,2: > MPa
  • Elongation, A: >1%
  • Hardness: >41 HRC
• Condition after cold rolling + ageing - Cond CH900
  • Rm: > MPa
  • Rp0,2: > MPa
  • Elongation, A: >1%
  • Hardness: >46 HRB

X7CrNiAl17-7, 1. - mechanical properties

• Delivery condition for sheets / strips +AT
  • Rm: < MPa
  • Elongation, A: >19%
• Delivery condition for sheets / strips + P
  • Rm: > MPa
  • Rp0,2: > MPa
  • Elongation, A: >2%
• Delivery condition for bars +AT
  • Rm: < 850 MPa
  • Hardness, HB: <255

Heat treatment of 17-7PH, S, AISI 631:

• Cond. A - Saturation at O C
• Cond. TH - Saturation at F (760 C) for 1.5 hours, cooled for 1 hour to 55 F (15 C) for 0.5 hours, then aged at F (566 C) for 1.5 hours
• Cond. RH950 - Saturation at F (954 C) for 10 minutes with air cooling, product cooling to -100F (-73 C) for about 1.5 hours, aging at 950 F (510 C) for 1 hour
• Cond. C - Condition after cold rolling
• Cond. CH900 - Cold rolled condition after ageing at 900 F (482 C) for 1.0 hours with air cooling

In the above mentioned grades the company delivers: