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ASTM A437/A437M

ASTM A437/A437M Bolting Specification

Stainless Steel & Alloy Steel Bolting Specially Heat Treated for Steam & Gas Turbine

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Overview

ASTM A437/A437M Alloy Steel Bolting Material for High-Temperature Applications

Adfast Component LTD offers a wide range of ASTM A437/A437M alloy steel bolting materials and components, specially heat-treated for high-temperature applications such as steam turbines, gas turbines, and similar uses. These materials are designed to withstand extreme conditions, with their high-temperature properties ensured through strict control of chemistry, heat treatment, and room-temperature performance.

We manufacture Hex Bolts, Turbine Bolts, Studs, Socket Head Cap Screws, Threaded Rods, Nuts, and Washers in imperial sizes ranging from ¼” to 4” and metric variants from M6 to M100, available in both fine and coarse threads. Choose from Grades B4B, B4C, and B4D to meet your specific strength requirements for critical applications.

Chemical Composition

Mechanical Requirements

GradeBrinell Hardness Number, max
ASTM A437/A437M Grade B4B331
ASTM A437/A437M Grade B4C277
ASTM A437/A437M Grade B4D302

 

GradeBrinell Hardness NumberRockwell Hardness Number
ASTM A437/A437M Grade B4B293-341C 31-37
ASTM A437/A437M Grade B4C229-277C 21-29
ASTM A437/A437M Grade B4D263-311C 27-33

 

GradeDiameter, in. [mm]Tensile Strength, min, ksi [MPa]Yield Strength (0.2 % offset) min, ksi [MPa]Elongation in 2 in. or 50 mm, min, %Reduction of Area, min, %
ASTM A437/A437M Grade B4B…145 [1000]105 [720]1330
ASTM A437/A437M Grade B4C…115 [790]85 [585]1850
ASTM A437/A437M Grade B4D21/2 [65] and under125 [860]105 [720]1850
over 21/2 to 4 [65 to  100]110 [760]95 [655]1745
over 4 to 7 [100 to 180]100 [690]85 [585]1645

 

Impact Test

Heat Treatment

  • (A) Grades B4B and B4C shall be heated to a temperature range of 1875 to 1925 °F [1025 to 1050 °C] and liquid quenched to below 600 °F [316 °C]. The material Grades B4B and B4C shall then be uniformly reheated for tempering at a tempering temperature at least 100 °F [55 °C] higher than the proposed operating temperature but not less than 1150 °F [620 °C], then air or furnace cooled to room temperature. The material shall be at the tempering temperature for a minimum of 2 h. Double tempering may be used to enhance properties.
  • (B) Grade B4D shall be heated to a temperature range of 1700 to 1750 °F [925 to 954 °C] and oil quenched. The material shall then be uniformly reheated or tempered at a temperature of 1200 °F [650 °C] minimum, followed by air or furnace cooling to room temperature.
  • (C) Stress relieving treatment of the bar material is required after any stretcher, roller, or rotary-straightening or cold-finishing operations performed after heat treatment for mechanical properties. Local gagging or press straightening to correct camber limitations in excess of 1/4 in. in any 5 ft [6 mm in any 1.5 m] shall be followed by a stress relieving heat treatment. The minimum stress relieving temperature shall be 100 °F [55 °C] below the minimum tempering temperature 1875 to 1925 °F [1025 to 1050 °C] for Grades B4B and B4C or 1700 to 1750 °F [925 to 954 °C] for Grade B4D.

Coating Specifications

A153/A153M Specification for Hot Dip Galvanising (Zinc Coating) on Iron and Steel Hardware
B633 Specification for Electrodeposited Coatings of Zinc on Iron and Steel
B695 Specification for Coatings of Zinc Mechanically Deposited on Iron and Steel
B696 Specification for Coatings of Cadmium Mechanically Deposited
B766 Specification for Electrodeposited Coatings of Cadmium
F1941/F1941M Specification for Electrodeposited Coatings on Mechanical Fasteners, Inch and Metric
F2329/F2329M Specification for Zinc Coating, Hot-Dip, Requirements for Application to Carbon and Alloy Steel Bolts, Screws, Washers, Nuts, and Special Threaded Fasteners

Renowned Brands

Bolting Components Marking

Product Shall be Marked with our manufacturing trade mark Adfast Component LTD along with the designated Grade.
Grade and manufacturer’s identification symbols shall be applied to one end of studs and to the heads of bolts and screws of all sizes. (If the available area is inadequate, the grade symbol may be marked on one end and the manufacturer’s identification symbol marked on the other end.) For bolts and screws smaller than 1⁄4 in. [6 mm] in diameter and studs smaller than 3⁄8 in. [10 mm] in diameter and for 1⁄4 in. [6 mm] in diameter studs requiring more than a total of three symbols, the marking shall be a matter of agreement between the purchaser and the manufacturer.

Certification

  • EN 10204 3.1
  • EN 10204 3.2
  • PED 2014/68/EC
  • MERKBLATT AD 2000 W2/W7/W10
  • API 20 E BSL 1/ BSL 2
  • NACE MR 0175
  • NACE MR 0103

Testing Standards

  • E112 Test Methods for Determining Average Grain Size
  • A962/A962M Specification for Common Requirements for Bolting Intended for Use at Any Temperature from Cryogenic to the Creep Range

Threading Specs

  • ASME B1.1 Unified Inch Screw Threads (UN and UNR Thread Form)
  • ASME B1.3 Screw Thread Gaging System for Dimensional Acceptability - Inch Screw Threads (IN, UNR, and UNJ)
  • ASME B1.13M Metric Screw Threads- M Profile
  • ASME B1.21M Metric Screw Threads - MJ Profile
  • ASME B1.2 Gauges & gauging for Unified Screw Threads(Imperial)

Supplementary Requirements

S1Non-Destructive Examination
S2Stress Rupture Testing-Grade B4B
S3Grain Size-Grades B4B and B4C