ASTM A193 B8

Description of Material

ASTM A193 B8 is an austenitic stainless steel used throughout the Oil and Gas industry as a cost effective material for general connections including valves, flanges, and fittings where corrosion protection is required. Provided as standard in a class 1 solution annealed condition for general use, this material is also available in a class 2 strain hardened condition to increase its strength and general mechanical properties.

LoneStar Fasteners Europe offer ASTM A193 B8 in commercial grades, covering the basic requirements of ASTM A193, but can also offer with supplementary testing meeting additional requirements of the standard or to meet the demands of OEM or international accredited certification bodies.

ASTM A193 B8: Forms

  LoneStar Manufacture 
Stud Bolts
Hexagon Headed Bolting
Socket Headed Bolting
Double Ended and Waisted Studs
Associated OEM Parts

ASTM A193 B8: Sizes and Threads 

  LoneStar Manufacture 
Metric Coarse
Metric Fine
Imperial UNC
Imperial 8UN
Imperial UNF
Metric sizes available Up to M100
Imperial sizes available Up to 6.00″

ASTM A193 B8: Chemical Composition

Carbon 0.08 % Max
Manganese 2.00 % Max
Phosphorus 0.045 % Max
Sulphur 0.030 % Max
Silicon 1.00 % Max
Chromium 18.0-20.0 %
Nickel 8.0-11.0 %
Copper  …
Niobium  …
Titanium  …
Vanadium  …
Aluminium  …
Nitrogen  …

ASTM A193 B8: Mechanical Properties

Class 1

Tensile Strength Min, Ksi 75
Yield Strength  min, 0.2% offset Ksi 30
Elongation in min% 30
Reduction of Area min% 50
Hardness Max 96 HRB

Class 2

¾” and Under ¾” to 1” Inc.
Tensile Strength Min, Ksi 125  115
Yield Strength  min, 0.2% offset Ksi 100 80
Elongation in min% 12 15
Reduction of Area min% 35 35
Hardness Max 35 HRC 35 HRC

Class 2

Over 1” to 1.1/4” Inc. Over 1.1/4” to 1.1/2” Inc. 
Tensile Strength Min, Ksi 105 100
Yield Strength  min, 0.2% offset Ksi 65 50
Elongation in min% 20 28
Reduction of Area min% 35  45
Hardness Max 35 HRC 35 HRC

Similar or Equivalent Standards 

Class 1 Class 2
AISI 304 AISI 304
AFNOR Z6CN 18.09  AFNOR Z6CNN 18.09
AFNOR Z6CN 18.09  AFNOR Z6CNN 18.09
AFNOR Z6CN 18.09  AFNOR Z6CNN 18.09


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