Alloy

4130

AISI/SAE 4130
(UNS G 41300) 		a “30” Carbon Chromium-Molybdenum Alloy Steel
Typical Analysis
C Mn P S Si Cr Mo
.30 .50 .015 .010 .25 .90 .20
Characteristics
  • We stock this quality of E-4130 to meet the regulations of API Spec.6A.
  • Bars are heat treated to Designation 75K and are Charpy V-notch impact- tested to Classification K.
  • Stocks also conform to NACE Standard MROI- 75 with a maximum hardness of HRC22/HB235. E-4130 is readily machineable and weldable.
Typical Applications
  • Flanges, wellhead components, tool joints, etc.
Typical Heat Treatment
  • Forging
    • Commence 1200℃ max.
    • Finish 950℃
  • Annealing
    • 830℃/ 855℃ Cool slowly in furnace
  • Normalizing
    • 870℃/ 930℃ Cool in air
  • Hardened & Tempered: 840℃/ 870℃ Water quench, 855℃/ 885℃ Oil quench; 430℃/ 700℃ According to properties required.
Mechanical Properties
  • Annealed Typical
  • Tensile Strength - 80,000 psi
  • Yield Strength - 80,000 psi
  • Elongation - 28%
  • Reduction of Area - 57%
  • Hardness - 22 Rc Max, surface
AISI/SAE 4130
(UNS G 41300) 		Mechanical Properties
  • Normalized, Hardened & Tempered at 1150℉ min
  • Typical, API-6A Designation 75K, Classification K
Size - inches 4" Dia 7" Dia 9 ½" Dia 15 ¼" Dia
Size - mm 101.6 177.8 241.3 387.4
Tensile Strength, psi 105,500 107,000 104,000 103,000
Tensile Strength, N/mm² 727 737 717 710
Yield Strength, psi 78,480 80,000 77,400 78,000
Yield Strength, N/mm² 541 551 534 538
Elongation (%) 26.8 25.1 28.2 24
Reduction of Area (%) 66.5 64.0 68.3 71.0
HB 223 228 225 220
CVN @-75℉ 45/50/47 35/39/42 36/40/43 40/38/42

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