ASTM B473 Specification

Forgings, Fasteners, Boltings, Stud Bolts, Screws, Nuts

Scope

ASTM B473 specification covers UNS N08020, UNS N08026, and UNS N08024 bar and wire other than required for reforging.

Related Specifications of ASTM B473

ASTM A276 ASTM A479

ASTM B473 Chemical Composition

Composition, %	Element
UNS	C, max	Mn, max	P, max	S, max	Si, max	Ni	Cr	Mo	Cu	Nb + Ta	N	Fe
UNS N08026	0.03	1.00	0.03	0.03	0.50	33.00 to 37.20	22.00 to 26.00	5.00 to 6.70	2.00 to 4.00	...	0.10 to 0.16	remainder^A
UNS N08020	0.07	2.00	0.045	0.035	1.00	32.00 to 38.00	19.00 to 21.00	2.00 to 3.00	3.00 to 4.00	8 × C-1.00	...	remainder^A
UNS N08024	0.03	1.00	0.035	0.035	0.50	35.00 to 40.00	22.50 to 25.00	3.50 to 5.00	0.50 to 1.50	0.15 to 0.35	...	remainder^A

ASTM B473 Mechanical Requirements

Condition	Diameter or Thickness, in. (mm)	Tensile Strength, min		Yield Strength, min		Elongation in 2 in (50.8 mm), min, %	Reduction of area, min, %
Condition	Diameter or Thickness, in. (mm)	ksi	MPa	ksi	MPa	Elongation in 2 in (50.8 mm), min, %	Reduction of area, min, %
Annealed, hot finished or cold finished	All	80	551	35	241	30.0^B	50
Annealed, strain-hardened	Up to 2 (50.8) incl	90	620	60	415	15	40

ASTM B473 Heat Treatment

The product of UNS N08020 alloy shall be furnished in the stabilized-annealed condition. The product of UNS N08026 alloy shall be furnished in the solution-annealed condition. The product of UNS N08024 alloy shall be furnished in the annealed condition.
NOTE 2-The recommended annealing temperatures all followed by quenching in water or rapidly cooling by other means are as follows: 1700 to 1850°F (927 to 1010°C) for UNS N08020, 2050 to 2200°F (1121 to 1204°C) for UNS N08026, and 1925 to 1975°F (1052 to 1079°C) for UNS N08024.

ASTM B473 Certifications

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

ASTM B473 Supplementary Requirements

S1	Corrosion Tests for UNS N08020