EN30B

EN30B - BS 970 GRADE 835M30 BAR a 4 ¼% Nickel-Chromium-Molybdenum Alloy Steel
Typical Analysis
C Mn P S Si Ni Cr Mo
.28/.33 .40/.60 .025x .015x .10/.35 4.0/4.3 1.1/1.24 .20/.40
Characteristics
  • This product is stocked in two heat treat conditions:
    • Quench and tempered
    • Annealed
  • EN30B may be carburized if extra wear resistance is required.
  • This steel may be calcium treated.
  • * EN30B is produced to AQ, AMS 2301 cleanliness level.
Typical Applications
  • Down-hole tools, heavy duty construction tools, rock drilling bit bodies, highly stressed gears and transmission components, heavy duty shafts and rolls.
Typical Heat Treatment
  • Forging – Commence 1200℃ (2190℉) Max.
  • Double Annealing – Austenitize 850℃ to 865℃ (1560℉ to 1590℉)
    • Quench and tempered
  • Machinability: Double Anneal at 635℃ to 650℃ (1175℉ to 1200℉)
    • Do not exceed 660℃ (1220℉)
    • A Hardness of 269 HB Max is achievable
  • Normalize, Temper & Stress Relieve - Austenitize 850℃ to 865℃ (1560℉ to 1590℉).
    • Air cool to room temperature
    • Temper 530℃ (990℉), air cool
    • Stress Relieve 500℃ (930℉), air cool
  • Hardened & Tempered Austenitize 850℃ to 865℃ (1560℉ to 1590℉) Forced air cool or oil quench. Temper at 200℃ (400℉), air cool.
Mechanical Properties
  • Measured at 1" below the surface
EN30B - BS 970 GRADE 835M30 BAR Mechanical Properties
  • Quench, Tempered & Stress Relieved - Typical
  • Annealed - Typical - HB 269 Maximum
Size - inches Up to and including 10" dia Greater than 10" Dia
Yield Strength, psi 135,000 psi 130,000 psi
Ultimate 160,000 psi 150,000 psi
Elongation (%) 13% 13%
Reduction of Area (%) 50% 45%
CVN at -50℉ 15 ft-lbs 15 ft-lbs
CVN at Room Temperature 45 ft-lbs 45 ft-lbs
Hardness HB321 to 363 HB321 to 363

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