ASTM A437 B4b properties 1

[kclim]

Hello all,

Looking for properties for a high temperature turbine bolting material A437 B4b, in particular Young's Modulus and CTE for the purpose of a bolting calculation. The actual standard specifies hardness and tensile and yield strengths, but not YM or CTE which is understandable.

Does anyone know where I might be able to find a standard set of values for these parameters? I've tried on

http://www.matweb.com

to no avail.

Thanks in advance

 

[Rich2001]

From ASME SECTION II Part A SA-437

TENSILE REQUIREMENTS

Yield
Tensile Strength Elongation
Strength, (0.2% in 2 in. or Reduction
min, ksi offset) min, 50 mm, of Area,
Grade [MPa] ksi [MPa] min, % min, %
B4B 145 [1000] 105 [720] 13 30



CHEMICAL REQUIREMENTSA
Grades B4B
Product Variation, %
Over or under
Element Range, %
Carbon 0.20–0.25 0.02
Manganese 0.50–1.00 0.03
Phosphorus, max 0.025 0.005 over
Sulfur, max 0.025 0.005 over
Silicon 0.20–0.50 0.05
Nickel 0.50–1.00 0.03
Chromium 11.00–12.5 0.15
Molybdenum 0.90–1.25 0.05
Vanadium 0.20–0.30 0.03
Tungsten 0.90–1.25 0.05
Aluminum, maxB 0.05
Titanium, max 0.05
Tin, max 0.04

Steel to which lead has been added shall not be used.
Total, Soluble + Insoluble.

IMPACT REQUIREMENTS
Minimum Impact Value,
Grade ft · lbf [J]
B4B 10 [14]


HARDNESS REQUIREMENTS FOR BOLTS AND STUDS
Brinell Hardness
Grade Number, max
B4B 331

HARDNESS REQUIREMENTS FOR NUTS AND WASHERS
Grade Brinell Hardness Number Rockwell Hardness Number
B4B 293–341 C 31–37

 

[CoryPad]

kclim,

This is 422 stainless steel. At 298 K, the elastic modulus E is 199 GPa, and the thermal expansion coefficient &[ignore]alpha[/ignore]; is 11.2 &[ignore]middot[/ignore]; 10^-6 K^-1. You can find this information from the Material Data Sheet at the ASM International site:

http://www.asminternational.org/datasheets/index.jsp

Regards,

Cory

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.