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Germany DIN 21 耐蚀钢紧固件的机械特性-第3部分：不受拉应力的止动螺钉和类似的紧固件 and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: 21 / 21
Category Grade Standard Region/Area Standard Content
Metals 21 DIN EN ISO 3506-3 Germany 耐蚀钢紧固件的机械特性-第3部分：不受拉应力的止动螺钉和类似的紧固件

Chemical composition(mass fraction)(wt.%) of the 21

Element Min Max Similar
Ti - 0.8000 -
Ni 11.0000 14.0000 -
Mo 2.0000 2.5000 -
Cr 16.5000 18.5000 -
S - 0.0300 -
P - 0.0450 -
Mn - 2.0000 -
Si - 1.0000 -
C - 0.0800 -
Ti - 0.8000 -
Ni 11.0000 14.0000 -
Mo 2.0000 2.5000 -
Cr 16.5000 18.5000 -
S - 0.0300 -
P - 0.0450 -
Mn - 2.0000 -
Si - 1.0000 -
C - 0.0800 -

Mechanical Properties of steel grade 21

Yield
Rp0.2 (MPa)		 Tensile
Rm (MPa)		 Impact
KV/Ku (J)		 Elongation
A (%)		 Reduction in cross section on fracture
Z (%)		 As-Heat-Treated Condition Brinell hardness (HBW)
381 (≥) 665 (≥) 22 42 34 Solution and Aging, Annealing, Ausaging, Q+T,etc 144

Physical Properties of steel grade 21

Temperature
(°C)		 Modulus of elasticity
(GPa)		 Mean coefficient of thermal expansion 10-6/(°C) between 20(°C) and Thermal conductivity
(W/m·°C)		 Specific thermal capacity
(J/kg·°C)		 Specific electrical resistivity
(Ω mm²/m)		 Density
(kg/dm³)		 Poisson’s coefficient, ν
21 - -     0.44 -  
878 391 - 14.3 124   -  
522 - 23 42.2   211 412

Heat Treatment of steel grade 21

Heat treated : 1166°C - 1154°C

Technological Curves of steel grade 21

Cross Reference Table (Equivalent Grade) of 21

Grade Standard Country Application
ASTM 5140
AISI 201
AISI 202
1.2767
17-4PH
AISI 1052
AISI 416Se
AISI 1330
AISI 205 Stainless Steel
AISI A10
AISI A2
AISI A3
AISI A4
1.0036
1.0037
SAE J403
UNS G10100
AMS 4924
ASTM A36
Electrode 100S-1
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