EN19 Steel

EN19 Steel Specifications

Material Selection and Specification of EN19 Round Bar

Specification Details
Standard BS 970 709M40, AISI 4140, DIN 42CrMo4
Grade EN19
Hex Bar Size 2-100mm A/F
Flat Bar Size Thickness: 2 -100mm, Width: 10 to 500mm
Round Bar Size Diameter: 3-~800mm
Square Bar Size 4 to 100mm
Rectangle Size 33 x 30mm to 295 x 1066mm
Billet Size 1/2″ to 495mm Diameter
Surface Sand Blasting Finished, Bright, Hot Rolled Pickled, Cold Drawn, Polished, Hairline
Finish Polish, Grinding, Centreless Ground, Black, Bright, Cold Drawn, Peeled, Slit Rolled Edge, Hot Rolled, Hot Rolled Annealed, Rough Turned
Tolerance H9, H10, H11, H12, H13, K9, K10, K11, H8, K12 or as per client requirements
Processing Bar cutting up to 650mm
Condition Hardened & Tempered, Annealed
Technique Hot Rolled, Cold Drawn, Cold Rolled, Forged Round Bar, Rod
Compliance Conforms to NACE MR0175/ISO 15156

EN19 Chemical Composition

Element Composition (%)
Carbon (C) 0.35 – 0.45
Silicon (Si) 0.15 – 0.30
Manganese (Mn) 0.50 – 0.80
Phosphorus (P) 0.035 max
Sulfur (S) 0.040 max
Chromium (Cr) 0.90 – 1.50
Molybdenum (Mo) 0.20 – 0.40
Iron (Fe) Balance

EN19 Mechanical Properties

Property Value
Tensile Strength 655 MPa (95,000 psi)
Yield Strength 415 MPa (60,200 psi)
Bulk Modulus 140 GPa (20300 ksi)
Shear Modulus 80 GPa (11600 ksi)
Elastic Modulus 190-210 GPa (27557-30458 ksi)
Poisson’s Ratio 0.27-0.30
Elongation at Break 25.70%
Hardness (Brinell) 197 HB
Machinability 65% (based on AISI 1212 as 100%)

EN19 Heat Treatment

Process Temperature Range
Normalizing 870-900°C
Annealing 872°C, slowly cooled in the furnace
Hardening 845°C, followed by oil quenching
Tempering 205-649°C, depending on desired hardness

EN19 Applications

  • Hydraulic fittings and adapters
  • Automotive components
  • Heavy-duty shafts and spindles
  • Transmission gears and crankshafts
  • High-strength industrial engineering parts

Key Features & Advantages

  • High tensile strength and wear resistance
  • Excellent toughness and shock resistance
  • Good machinability
  • Suitable for heat treatment applications
  • Used in demanding mechanical environments

Equivalent Grades

Standard Equivalent Grade
BS 970 709M40
AISI 4140
DIN 42CrMo4
IS 40Cr4Mo3
EN EN19

EN19 Machinability & Welding

  • Machinability: Good in annealed conditions
  • Welding: Requires preheating and post-weld heat treatment

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