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.

16MnCr5/20MnCr5 Case Hardening Steel

1.Chemical Composition

Grade Number C Si Mn P S Cr
16MnCr5 1.7131 0.14-0.19 ≤ 0.4 1.0-1.3 ≤ 0.025 ≤ 0.035 0.8-1.1
16MnCrS5 1.7139 0.14-0.19 ≤ 0.4 1.0-1.3 ≤ 0.025 0.02-0.04 0.8-1.1
20MnCr5 1.7147 0.17-0.22 ≤ 0.4 1.1-1.4 ≤ 0.025 ≤ 0.035 1.0-1.3
20MnCrS5 1.7149 0.17-0.22 ≤ 0.4 1.1-1.4 ≤ 0.025 0.02-0.04 1.0-1.3

2.Related Specifications

DIN AFNOR BS ASTM/SAE
16MnCr5 16MC5 590M17 5115
20MnCr5 20MC5 - 5120

3.Heat Treatment & Mechanical Property

16MnCr5/16MnCrS5 20MnCr5/20MnCrS5
Normalizing,°C 840-870 840-870
Annealing,°C 650-700 650-700
Carburizing,°C 880-980 880-980
Core Hardening,°C 860-900 860-900
Case Hardening,°C 780-820 780-820
Tempering,°C 150-200 150-200

 Hardness requirements for delivery conditions

Conditions 16MnCr5/16MnCrS5 20MnCr5/20MnCrS5
Treated to improve shearability(+S) - ≤255
Soft annealed(+A) ≤207 ≤217
Treated to Hardness range(+TH) 156-207 170-217
Treated to ferrite-pearlite structure and hardness range(+FP) 140-187 152-201
Normalized(+N) 138-187 140-201

Hardenability Limits

Distance from quenched end mm 1.5 3.0 5.0 7.0 9.0 11 13 15 20 25 30 35 40
16MnCr5+H
16MnCrS5+H 		Min 39 36 31 28 24 21 - - - - - - -
Max 47 46 44 41 39 37 35 33 31 30 29 28 27
20MnCr5+H
20MnCrS5+H 		Min 41 39 36 33 30 28 26 25 23 21 - - -
Max 49 49 48 46 43 42 41 39 37 35 34 33 32
16MnCr5+HH
16MnCrS5+HH 		Min 42 39 35 32 29 26 24 22 20 - - - -
Max 47 46 44 41 39 37 35 33 31 30 29 28 27
20MnCr5+HH
20MnCrS5+HH 		Min 44 42 40 37 34 33 31 30 28 26 25 24 23
Max 49 49 48 46 43 42 41 39 37 35 34 33 32
16MnCr5+HL
16MnCrS5+HL 		Min 39 36 31 28 24 21 - - - - - - -
Max 44 43 40 37 34 32 30 28 26 25 24 23 22
20MnCr5+HL
20MnCrS5+HL 		Min 41 39 36 33 30 28 26 25 23 21 - - -
Max 46 46 44 42 39 37 36 34 32 30 29 28 27

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

Size,mm Tensile,Mpa Yield,Mpa Elongation,% Charpy Impact, J Brinell Hardness,HB
Φ340 540 315 29 76/72/70 152-163
Φ400 595 340 24 60/54/50 155-179
Φ460 560 310 32 64/70/74 152-183

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

RFQ 16MnCr5/20MnCr5 STEEL