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ASTM A266 Specification

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

Scope

Related Specifications of ASTM A266

ASTM A266 Chemical Composition

Composition, % Element
C, max Mn P, max S, max Si
ASTM A266 Grades 1 and 2 0.30 0.40-1.05 0.025 0.025 0.15-0.35
ASTM A266 Grade 3 0.35 0.80-1.35 0.025 0.025 0.15-0.35
ASTM A266 Grade 4 0.30 0.80-1.35 0.025 0.025 0.15-0.35

ASTM A266 Mechanical Requirements

Grade ASTM A266 Grade 1 ASTM A266 Grades 2 and 4 ASTM A266 Grade 3
Tensile strength, min, ksi [MPa] 60-85 [415-585] 70-95 [485-655] 75-100 [515-690]
Yield strength (0.2 % offset), min, ksi [MPa] 30 [205] 36 [250] 37.5 [260]
Elongation in 2 in. or 50 mm, min, % 23 20 19
Reduction of area, min, % 38 33 30

ASTM A266 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 A266 Supplementary Requirements

S1 Rough Turning and Boring
S2 Alternative Tension Test Orientation
S3 Hydrostatic Test
S4 Magnetic Particle Examination
S5 Liquid Penetrant Examination
S6 Macroetch Test
S7 Product Analysis
S8 Specimen Location on Forged Hubs
S9 Hardness
S10 Grain Size
S11 Restriction on Residual Elements (Applicable to Heat Analysis)
S12 Restriction on Carbon (Applicable to Grade I)
S13 Impact Tests
S14 Individual Forging
S15 Carbon Equivalancy