16MnCr5/20MnCr5 Case Hardening Steel

16MnCr5/20MnCr5 Steel is defined as Mn-Cr case hardening steel as per EN10084 Standard.Compared with 16MnCr5,20MnCr5 has a little higher on Carbon,Manganese and Chromium,both of them have good hardenability,machinability and wear resistance,but poor in weldability.They are also supplied as 16MnCrS5/20MnCrS5 with “S” control 0.02-0.04%.16MnCr5/20MnCr5 are suitbale for gears, screws, bolts, bushing and camshafts.

20MnCr5 Forged round steel

1.Chemical Composition

GradeNumberCSiMnPSCr
16MnCr51.71310.14-0.19≤ 0.41.0-1.3≤ 0.025≤ 0.0350.8-1.1
16MnCrS51.71390.14-0.19≤ 0.41.0-1.3≤ 0.0250.02-0.040.8-1.1
20MnCr51.71470.17-0.22≤ 0.41.1-1.4≤ 0.025≤ 0.0351.0-1.3
20MnCrS51.71490.17-0.22≤ 0.41.1-1.4≤ 0.0250.02-0.041.0-1.3

2.Related Specifications

DINAFNORBSASTM/SAE
16MnCr516MC5590M175115
20MnCr520MC5-5120

3.Heat Treatment & Mechanical Property

16MnCr5/16MnCrS520MnCr5/20MnCrS5
Normalizing,°C840-870840-870
Annealing,°C650-700650-700
Carburizing,°C880-980880-980
Core Hardening,°C860-900860-900
Case Hardening,°C780-820780-820
Tempering,°C150-200150-200

 Hardness requirements for delivery conditions

Conditions16MnCr5/16MnCrS520MnCr5/20MnCrS5
Treated to improve shearability(+S)-≤255
Soft annealed(+A)≤207≤217
Treated to Hardness range(+TH)156-207170-217
Treated to ferrite-pearlite structure and hardness range(+FP)140-187152-201
Normalized(+N)138-187140-201

Hardenability Limits

Distance from quenched end mm1.53.05.07.09.01113152025303540
16MnCr5+H
16MnCrS5+H
Min393631282421-------
Max47464441393735333130292827
20MnCr5+H
20MnCrS5+H
Min41393633302826252321---
Max49494846434241393735343332
16MnCr5+HH
16MnCrS5+HH
Min423935322926242220----
Max47464441393735333130292827
20MnCr5+HH
20MnCrS5+HH
Min44424037343331302826252423
Max49494846434241393735343332
16MnCr5+HL
16MnCrS5+HL
Min393631282421-------
Max44434037343230282625242322
20MnCr5+HL
20MnCrS5+HL
Min41393633302826252321---
Max46464442393736343230292827

16MnCr5/20MnCr5 Mechanical Property -Annealing(+A)

Size,mmTensile,MpaYield,MpaElongation,%Charpy Impact, JBrinell Hardness,HB
Φ3405403152976/72/70152-163
Φ4005953402460/54/50155-179
Φ4605603103264/70/74152-183

4.Supply Form & Size

  • Round Bars:  Dia.80 – 1,000mm as Forged
  • Flat / Square Bars:  Thickness Max.800mm
  • Shafts, Rollers, Blocks:  Customized or According to Drawing
  • Rolled Round Bars:  Dia.16 – 130mm with UT Assurance

Heat treatment: Normalizing (+N), Annealing (+A)
Surface finish:Black / Rough turned / Peeled