ASTM A453 Gr.668A
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Material standard specification for high-temperature bolting,A453 668A with expansion coefficients comparable to austenitic stainless steel ASTM A453 Grade 668A datasheet,ASTM A453 grade 668A Chemical compositions, ASTM A453 Gr.668A mechanical properties from Steel making, ESR melted, Blooming, 668A Forging, Hot rolling, Heat treatment, Straightening,Ultrasonic test,Cold working or Machined. All of these materials conform to Military standard, nuclear power. Technical specification ASTM A453
TECHNICAL SPECIFICATION - ASTM A453 GRADE 668A
TECHNICAL SPECIFICATION: ASTM A453 - 2011
OFFICIAL TEST CERTIFICATE: issued by TUV - SGS - BV
MATERIAL CATEGORY: high-temperature bolting, with expansion coefficients comparable to austenitic stainless steel
CHEMICAL COMPOSITION (WEIGHT %)
C (％): ≤ 0.08
Si (％): ≤ 1.00
Mn (％): ≤ 2.00
P (％) ≤: 0.040
S (％) ≤: 0.030
Cr (％): 13.5 ~ 16.0
Ni (％): 17.5 ~ 21.5
Mo (％): ≤ 1.50
W (%): -
Ti (%): 2.20 ~ 2.80
Ti (%): 2.20 ~ 2.80
Nb (%): -
Al (%): ≤ 0.50
V (%): ≤ 0.50
B (%): 0.001 ~ 0.010
Cu (%): -
MECHANICAL PROPERTIES UNDER ROOM TEMPERATURE
Form: rod and bar
Condition: solution treated 900 +/-14 Deg. hold 2h, liquid quench. hardening treatment 720 -/+14 Deg. hold 16h, air cool
Form: rod and bar
Condition: solution treated 900 +/-14 Deg. hold 2h, liquid quench. hardening treatment 720 -/+14 Deg. hold 16h, air cool
Tensile strength,σb/≥ MPa: 895
Yield strength, σ0.2/≥ MPa: 585
Elongation, δ ≥(％): 15.0
Reduction of area, ф ≥ (％): 18.0
Hardness | HBW: 248 ~ 341
Yield strength, σ0.2/≥ MPa: 585
Elongation, δ ≥(％): 15.0
Reduction of area, ф ≥ (％): 18.0
Hardness | HBW: 248 ~ 341
Hardness | HRC: 24 ~ 37
STRESS RUPTURE REQUIREMENT
Test temperature: 650 Deg.
Stress /MPa: 515 min.
Time to rupture: 100h min.
Elongtation, (%): 3
TYPICAL APPLICATIONS