ASME SA-234 Grade WP91 Type 1 Structural and constructional steels

Material group: Ferrous Alloys / Structural and constructional steels
Country / Standard: United States / ASME

Data updates

Latest Update: 2024-02
Total number of updates: 4
Update History
2024-01 2023-10 2019-11

This material has 283 properties — only a subset is shown here.

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ASME SA-234 Grade WP91 Type 1 Chemical Composition

CRITERIA
VALUE
UNIT
CAS NUMBER
CRITERIA
Al
VALUE
≤ 0.02
UNIT
%
CAS NUMBER
7429-90-5
CRITERIA
C
VALUE
0.08 – 0.12
UNIT
%
CAS NUMBER
7440-44-0
CRITERIA
Cr
VALUE
8.0 – 9.5
UNIT
%
CAS NUMBER
7440-47-3
CRITERIA
Mn
VALUE
val1
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UNIT
%
CAS NUMBER
7439-96-5
CRITERIA
Mo
VALUE
val1
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UNIT
%
CAS NUMBER
7439-98-7
CRITERIA
N
VALUE
val1
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UNIT
%
CAS NUMBER
7727-37-9; 17778-88-0
CRITERIA
Nb
VALUE
val1
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UNIT
%
CAS NUMBER
7440-03-1
CRITERIA
Ni
VALUE
val1
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UNIT
%
CAS NUMBER
7440-02-0
CRITERIA
P
VALUE
val1
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UNIT
%
CAS NUMBER
7723-14-0
CRITERIA
S
VALUE
val1
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UNIT
%
CAS NUMBER
7704-34-9
CRITERIA
Si
VALUE
val1
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UNIT
%
CAS NUMBER
7440-21-3
CRITERIA
Ti
VALUE
val1
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UNIT
%
CAS NUMBER
7440-32-6
CRITERIA
V
VALUE
val1
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UNIT
%
CAS NUMBER
7440-62-2
CRITERIA
Zr
VALUE
val1
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UNIT
%
CAS NUMBER
7440-67-7

ASME Boiler and Pressure Vessel Code An International Code Section II - Part A Ferrous Material Specifications, American Society of Mechanical Engineers, 2025

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ASME SA-234 Grade WP91 Type 1 Physical Properties

Temperature

PROPERTY / VALUE
Modulus of Elasticity
190 — 210 GPa
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Thermal Conductivity
22.3 W/(m∙°C)
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Density
val1
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kg/dm³
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Poisson Coefficient
val1
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Coefficient of Thermal Expansion (CTE)
val1
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10-6/°C
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This material has 283 properties — only a subset is shown here.

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ASME SA-234 Grade WP91 Type 1 Heat Treatments

  • Fittings, after forming at an elevated temperature, shall be cooled to a temperature below the critical range under suitable conditions to prevent injurious defects caused by too rapid cooling, but in no case more rapidly than the cooling rate in still air.
    Fittings shall be normalized at 1040°C (1900°F) minimum, and 1080°C (1975°F) maximum, and tempered in the temperature range of 730°C (1350°F) to 800°C (1470°F) as a final heat treatment.
    Minimum tempering temperature shall be 730°C (1350°F).
    Liquid quenching followed by tempering shall be permitted when approved by the purchaser.

ASME SA-234 Grade WP91 Type 1 Mechanical Properties

Temperature

PROPERTY / VALUE
Tensile Strength
≥ 620 MPa
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Brinell Hardness (HB)
val1
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Elongation, A
val1
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%
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Yield Strength, Rp0.2
val1
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MPa
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ASME SA-234 Grade WP91 Type 1 International Equivalent Materials

Showing 15 of 104 results.

MATERIAL
STANDARD
COUNTRY / PRODUCER
EQUIVALENCE CATEGORY
MATERIAL
K90901
STANDARD
UNS
COUNTRY / PRODUCER
United States
EQUIVALENCE CATEGORY
Official
MATERIAL
SA-335 Grade P91 Type 1
STANDARD
ASME
COUNTRY / PRODUCER
United States
EQUIVALENCE CATEGORY
Composition 100%
MATERIAL
A 234 Grade WP91 Type 1
STANDARD
ASTM
COUNTRY / PRODUCER
United States
EQUIVALENCE CATEGORY
Official
MATERIAL
SA-387 Grade 91 Type 1
STANDARD
ASME
COUNTRY / PRODUCER
United States
EQUIVALENCE CATEGORY
Composition 100%
MATERIAL
SA-182 F 91 Type 1
STANDARD
ASME
COUNTRY / PRODUCER
United States
EQUIVALENCE CATEGORY
Composition 100%
MATERIAL
A 335 Grade P91 Type 1
STANDARD
ASTM
COUNTRY / PRODUCER
United States
EQUIVALENCE CATEGORY
Composition 100%
MATERIAL
A 182 F 91
STANDARD
ASTM
COUNTRY / PRODUCER
United States
EQUIVALENCE CATEGORY
Composition 100%
MATERIAL
SA-199 Grade T91
STANDARD
ASME
COUNTRY / PRODUCER
United States
EQUIVALENCE CATEGORY
Implicit
MATERIAL
SA-213 Grade T91 Type 1
STANDARD
ASME
COUNTRY / PRODUCER
United States
EQUIVALENCE CATEGORY
Implicit
MATERIAL
SA-336 Grade F91 Type 1
STANDARD
ASME
COUNTRY / PRODUCER
United States
EQUIVALENCE CATEGORY
Implicit
MATERIAL
SA-369 FP91 Type 1
STANDARD
ASME
COUNTRY / PRODUCER
United States
EQUIVALENCE CATEGORY
Implicit
MATERIAL
A 182 F 91 Type 1
STANDARD
ASTM
COUNTRY / PRODUCER
United States
EQUIVALENCE CATEGORY
Composition 100%
MATERIAL
P91
STANDARD
NB
COUNTRY / PRODUCER
China
EQUIVALENCE CATEGORY
Composition 100%
MATERIAL
S50460
STANDARD
UNS
COUNTRY / PRODUCER
United States
EQUIVALENCE CATEGORY
Implicit
MATERIAL
K91560
STANDARD
UNS
COUNTRY / PRODUCER
United States
EQUIVALENCE CATEGORY
Implicit

Equivalence categories reflect chemical-composition and mechanical-property comparison — always verify suitability against the governing specification for your application.

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  • 104Cross References
  • 14Composition
  • 43Mechanical Properties
  • 68Physical Properties
  • 1Heat Treatment
  • -Metallography
  • -Machinability
  • -Stress-Strain
  • -Formability
  • -Fatigue
  • -Fracture
  • 22Creep
  • -Joints
  • -Coatings
  • 13Dimensions
  • -Tribology
  • -Corrosion
  • -Ageing
  • -Weatherability
  • -Irradiation
  • 18Total Suppliers