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Chrome-Moly

Chromium-Molybdenum Alloy Steel or Chrome-Moly, CrMo is an alloy steel intended for high temperature and high pressure services.  Chrome-Moly is used in the power generation industry and the petro-chemical industry because of its tensile strength, corrosion resistance and high-temperature strength.  Chrome-Moly has a better strength to Weight ratio than steel, which enables designers to use thinner wall pipe or smaller diameter tubing to reduce overall weight.

Chromium-Molybdenum Alloy Steel has strong resistance to rupturing at high temperatures and high pressures.  Chrome-Moly is also resistant to cracking from hydrogen attack and hot sulfide corrosion cracking.

Chrome-Moly grades P-11, P-22, P-91 and P-92 are used in the power industry.  Chrome-Moly grades P-5 and P-9 are used in petro-chemical refinery processes.  Chrome-Moly Forged Fittings & Flanges are available in grades F-5, F-9, F-11, F-22, F-91, F92.  Chrome-Moly Alloy Butt Weld Fittings are available in grades WP-5, WP-9, WP-11, WP-22, SP-91, WP-92.   F11 and F22 meet NACE-MRO 175.

Availability - Chrome-Moly

Specifications - Chrome-Moly

ASTM

A182, A335, A-387, A-234, 

ASME

SA182, SA335, SA-387, SA234

 

 

 

Chemical Composition- Chrome-Moly

Grade  UNS#  Composition 
F5  K41545

C     .15 max

Mn   .30 -.60

Cr   4.0 - 6.0

Mo   .44 - .65

F9 K90941

C     .15 max

Mn   .30 -.60

Cr   8.0 - 10.0

Mo   .90 - 1.10

F11 K11572

C     .10 - .20

Mn   .30 -.80

Cr   1.0 - 1.5

Mo   .44 - .65

F22 K21590

C     .05 - .15

Mn   .30 -.60

Cr   2.0 - 2.5

Mo   .87 - 1.13

F91 K91560

C     .08 - .12

Mn   .30 -.60

Cr   8.0 - 9.5

Mo   .85 - 1.05

Cb   .06 - .10

N     .03 - .07

Al    .04 max

V     .18 - .25

 

Design Features - Chrome-Moly

  • Strong resistance to rupturing at high temperatures and high pressures
  • May be used for Hydrogen Sulfide Corrosion Services
  • Resistant to cracking from hydrogen attack and embrittlement
  • Resistant to hot sulfide corrosion cracking
  • Can be used for NACE Applications where sour environments are under high temp and pressure
  • Can be used in NACE-MRO 175 Sour Service
  • Ideal for creep rupture applications
  • Can handle high temperatures with very low elasticity 

Applications - Chrome-Moly

  • Heat Exchangers
  • High Temperature Ducting
  • Oilfield Tools
  • Flanges
  • Pipe Clamps
  • Pressure Vessels
  • Valves

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