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SCM440 / 4140

SCM440 is specifically used in high-strength fasteners and has such advantages as stable components, low hazardous elements, high purity of steel content, small practical decarburized depth and few surface flaws; as well as easy spheroidizing annealing, low breakage rate in cold upsetting performance, stable quality in heat treatment and even hardness for a wide range of applications in engines, die molds, gears and driving parts.

Specification

TAIWAN - CNS CHINA - GB JAPAN - JIS USA - ASTM GERMANY - DIN
SCM440 42CrMoA SCM440 4140, 4142 42CrMo4, 42CrMoS4

Product Specification

Shape Size
Round Bar 13 14 15 16 17 18 19 20 21 22 24 25 26 28 30 32 34 36 38 40 42 44 45 46 48 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 125 130 135 140 145 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 315 325 335 345 355 365 375 385 395 405 415 425 435 445 455 465 475 485 495 505 515 525 535 545 555 565 575 585 595 605

Product Feature

  1. Excellent harden ability for deep harden in greater than the ordinary case hardening for anti-sawing locks.
  2. Less tendency for temper brittleness.
  3. Good performance in high temperature processing with a nice appearance afterwards.
  4. Good performance in weld ability.
  5. Good performance in impact absorption, such as where the hammer may bounce back and has barely any damage caused upon impact.

Advantages:

  1. Good performance in processing.
  2. Good performance in impact absorption.
  3. Easy welding.

Heat treatment conditions

Annealing Normalize Quench Tempering
830 Furnace cooling 830~ 880 Air cooling 830~ 880 Oil cooling 530~ 630 Prompt cooling

Mechanical properties

Tensile strength kgf/mm² Yield strength kgf/mm² Elongation % Cross section reduction rate % Impact value Hardness Hb
≧100 ≧85 ≧12 ≧45 ≧6 285~352