ASTM B574 UNS N10276 / N06022 Round Bar

ASME SB 574 Hastelloy Gr C276 Hex bar and Rod supplier in India

ASTM B574 - 17

The American Society for Testing and Materials A574 is a specification that lists down requirements for alloy steel socket-head cap screws. Per this specification, the A574 Socket Cap Screws are available in the quenched and tempered condition. Both quenching and tempering are heat treatments that are used to strengthen and harden alloy various steel grades.The quenching process performed on the A574 Bolts is a tightly controlled one and it involves heating the material following which the bolts are then rapidly cooled.

The A574 Hex Bolts is rapidly cooled in order to set the components in place as fast as possible. Tempering these fasteners is used to achieve both greater toughness as well as increased ductility by reducing the hardness of the material. Because the Grade AISI 8740 Bolts are tough, they naturally inherit other important yet simultaneous properties such as increased resistance to wear and good resistance to abrasion. Thus giving the alloy steel grade A574M Bolts an edge over conventional carbon steel fasteners. Hence the A574 Screw is used in demanding applications where they are a part of either machinery or structures in those areas where greater resistance to abrasion as well as higher yield strength are prime requirements for e.g. mining, earthmoving, quarrying, and construction.

ASTM B574 specification covers rod of low-carbon nickel-chromium- molybdenum alloys (UNS N10276, N06022, N06035, N06455, N06058, and N06059), low-carbon nickel-molybdenum- chromium-tantalum (UNS N06210), low-carbon nickel-chromium-molybdenum-copper alloy (UNS N06200), and low-carbon nickel-chromium-molybdenum-tungsten (UNS N06686), for use in general corrosive service.

ASTM B574 Chemical Composition

Element Composition Limits, %
Alloy 
N06035
Alloy 
N06044
Alloy 
N10276
Alloy 
N06022
Alloy 
N06455
Alloy 
N06059
Molybdenum 7.60–9.00 0.80-1.20 15.0–17.0 12.5–14.5 14.0–17.0 15.0–16.5
Chromium 32.25–34.25 43.5-45.3 14.5–16.5 20.0–22.5 14.0–18.0 22.0–24.0
Iron 2.00 max 0.3 max 4.0–7.0 2.0–6.0 3.0 max 1.5, max
Tungsten 0.60 max ... 3.0–4.5 2.5–3.5 ... ...
Cobalt, max 1.00 ... 2.5 2.5 2.0 0.3
Carbon, max 0.050 0.02 0.010 0.015 0.015 0.010
Silicon, max 0.60 0.20 0.08 0.08 0.08 0.10
Manganese, max 0.50 0.07-0.30 1.0 0.50 1.0 0.5
Vanadium, max 0.20 ... 0.35 0.35 ... ...
Phosphorus, max 0.030 0.020 0.04 0.02 0.04 0.015
Sulfur, max 0.015 0.020 0.03 0.02 0.03 0.010
Titanium ... 0.10-0.30 ... ... 0.7 max ...
Nickel remainder A Bal remainder A remainder A remainder A Bal
Aluminum 0.40 max 0.30 max ... ... ... 0.1–0.4
Copper 0.30 max ... ... ... ... 0.50 max
Tantalum ... ... ... ... ... ...
Nitrogen ... ... ... ... ... ...

Element Composition Limits, %
Alloy 
N06058
Alloy 
N06200
Alloy 
N10362
Alloy 
N06210
Alloy 
N06686
Molybdenum 18.5–21.0 15.0–17.0 21.5-23.0 18.0–20.0 15.0-17.0
Chromium 20.0- 23.0 22.0–24.0 13.8-15.6 18.0–20.0 19.0-23.0
Iron 1.5, max 3.0 max 1.25 max 1.0 max 5.0 max
Tungsten 0.3 max ... ... ... 3.0-4.4
Cobalt, max 0.3 max 2.0 max ... 1.0 ...
Carbon, max 0.010 0.010 0.010 0.015 0.010
Silicon, max 0.10 0.08 0.08 0.08 0.08
Manganese, max 0.5 0.5 0.60 0.5 0.75
Vanadium, max ... ... ... 0.35 ...
Phosphorus, max 0.015 0.025 0.025 0.02 0.04
Sulfur, max 0.010 0.010 0.010 0.02 0.02
Titanium ... ... ... ... 0.02-0.25
Nickel Bal remainder A remainder A remainder A remainder A
Aluminum 0.40 max 0.50 max 0.50 max ... ...
Copper 0.50 max 1.3–1.9 ... ... ...
Tantalum ... ... ... 1.5–2.2 ...
Nitrogen 0.02–0.15 ... ... ... ...

ASTM B574 HASTELLOY Bar Permissible Variations in Diameter and Out-of-Roundness of As Cold Finished Rods

Specified Diameter, in. (mm) Permissible Variations, in. (mm)
Diameter Out of Roundness, max
+
1/4 –7/16 (6.35–11.11), incl 0.012 (0.30) 0.012 (0.30) 0.018 (0.46)
Over 7/16 –5/8 (11.11–15.87), incl 0.014 (0.36) 0.014 (0.36) 0.020 (0.51)
Over 5/8 –3/4 (15.87–19.05), excl 0.016 (0.41) 0.016 (0.41) 0.024 (0.61)
3/4 –31/2 (19.05–88.9), incl 0.010 (0.25) 0.010 (0.25) 0.010 (0.25)

ASTM B574 UNS N10276 Mechanical Properties for As Cold Finished Rods

Alloy Grade Tensile Strength, min, psi (MPa) Yield Strength (0.2 % Offset), min, psi 
(MPa)
Elongation in 2 in. 
(50.8 mm) or 4DA 
min, %
N06059 1 120 (827) 85 (586) 20
  2 135 (931) 125 (862) 20
  3 160 (1103) 150 (1034) 15
N06686 1 120 (827) 85 (586) 20
  2 135 (931) 125 (862) 20
  3 160 (1103) 150 (1034) 20

ASTM B574 C276 Permissible Variations in Diameter and Out-of-Roundness of Hot or Cold Finished, Solution Annealed Rods

Specified Diameter, in. (mm) Permissible Variations, in. (mm)
Diameter Out of Roundness, max
+
5/16 Hot-Finished, Annealed, and Descaled Rods
5/16 –7/16 (7.94–11.11), incl 0.012 (0.30) 0.012 (0.30) 0.018 (0.46)
Over 7/16 –5/8 (11.11–15.87), incl 0.014 (0.36) 0.014 (0.36) 0.020 (0.51)
Over 5/8 –3/4 (15.87–19.05), excl 0.016 (0.41) 0.016 (0.41) 0.024 (0.61)
Hot-Finished, Annealed, and Ground or Turned Rods
3/4 –31/2 (19.05–88.9), incl 0.010 (0.25) 0 0.008 (0.20)

ASTM B574 UNS N06022 Mechanical Property Requirements for Hot or Cold Finished, Solution Annealed Rods

Alloy Tensile Strength, min, psi (MPa) Yield Strength (0.2 % Offset), min, psi 
(MPa)
Elongation in 2 in. 
(50.8 mm) or 4DA 
min, %
N10276 100 000 (690) 41 000 (283) 40
N06022 100 000 (690) 45 000 (310) 45
N06035  85 000 (586) 35 000 (241) 30
N06044 100 000 (690) 45 000 (310) 30
N06455 100 000 (690) 40 000 (276) 40
N06058 110 000 (760) 52 000 (360) 40
N06059 100 000 (690) 45 000 (310) 45
N06200 100 000 (690) 45 000 (310) 45
N10362 105 000 (725) 45 000 (310) 40
N06686 100 000 (690) 45 000 (310) 45
N06210 100 000 (690) 45 000 (310) 45

A) D refers to the diameter of the tension specimen.

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