ASTM4140 GB42crmo JIS SCr440 cold drawn carbon Alloy Hexagon Steel Bar
Chemical composition
| C | Si | Mn | P | S | Cr | Mo |
| 0.38-0.43% | 0.10-0.35% | 0.75-1.00% | ≤0.035% | ≤0.040% | 0.80-1.10% | 0.15-0.25% |
Equivalent Steel Grade
| Country | USA | German | British | Japan | China | Australia |
| Standard | ASTM A29 | DIN 17200 | BS 970 | JIS G4105 | GB/T 3077 | AS 1444 |
| Grades | 4140 | 1.7225/42CrMo4 | 42CrMo4 | SCM440 | 42CrMo | 4140 |
Mechanical Properties
|
Tensile
Strength (MPA) |
Yield Strength
(MPA) |
Reduction
(%) |
Elongation
(10%) |
Impact Strength
(Aku2/J) |
Hardness
(HB) |
| 1080 | 930 | 12 | 45 | 63 |
Anneal≤217HB
Q+T 28-32HRC |
| Shapes | Sizes |
Processing
|
| Steel Round Bar | 5mm to 63.5mm | Cold Drawn |
| Steel flat Bar | 63.5mm-120mm | smooth-turned and polished. |
| Cold drawn steel square bar | 5*5mm to120*120mm | Cold Drawn |
| Cold drawn steel hex bar | 5mm to120mm | Cold Drawn |
| Cold drawn steel hexagonal bar |
5mm to 120mm
(side to side) |
Cold Drawn |
| Straightness | Max 1mm/m | |
| Tolerance | h9 h10 h11 or as required | |
|
Dimension
(mm) |
T olerance deviation grade | |||||
| Grade h8 | Grade h9 | Grade h10 | Grade h11 | |||
| 3.01-6.0 | 0-0.012 | 0-0.018 | 0-0.030 | 0-0.048 | 0-0.075 | |
| 6.01-10.0 | 0-0.015 | 0-0.022 | 0-0.036 | 0-0.058 | 0-0.090 | |
| 10.01-18.0 | 0-0.018 | 0-0.027 | 0-0.043 | 0-0.070 | 0-0.110 | |
| 18.01-30.0 | 0-0.021 | 0-0.033 | 0-0.052 | 0-0.084 | 0-0.130 | |
| 30.01-50.0 | 0-0.025 | 0-0.039 | 0-0.062 | 0-0.100 | 0-0.160 | |
| 50.01-80.0 | 0-0.030 | 0-0.046 | 0-0.074 | 0-0.120 | 0-0.190 | |
|
h7 :grinding product
h8 :high-precision cold drawn product h9:precision cold drawn product |
h10:standard cold drawn product
h11:special shaped cold drawn product |
|||||
| P roduct variety | T he length of finished product | L ength tolerance |
| C old drawn product | 1000-6000 | 0-+20 |
| G rinding product | 1000-4000 | 0-+20 |
| Product mode | Straightness tolerance |
| Standard cold drawn | 0.7/1000~0.5/1000 |
| Precision and high precision | 0.4/1000 |
| P roduct mode | G rinding |
H
igh precison
cold drawn |
P recision cold drawn | S tardard cold drawn |
|
Surface roughness Ra(um)
|
0.40 | 0.80 | 1.60 | 3.20 |
| Type of steel | GB | ASTM(SAE) | JIS |
|
C
arbon steel
Low a lloy steel |
Q195,Q215,
Q235,Q345 |
A285MGr.B
A570MGr.A |
SS330
SS400,SS490... |
|
Quality
carbon steel |
10,20,35,40,60
20Mn,25Mn, 35Mn,40Mn |
1010,1020,1035,
1045,1060,1022, 1026,1037,1039 |
S10C,S20C,
S35C,S45C... |
|
Alloy
structure steel |
20Mn2,40Mn2,20Cr,40Cr,
20CrMo,35CrMo,42CrMo, 20CrMnTi,20Cr2Ni4, 40CrNiMo |
1320,1345,5120,
5140,4118,4135, 4140,3316,4340 |
SMn420,SMn438,
SCr420,SCr440 SCM430,SCM435 SCM440,SCN815 SNCM439 |
|
Cold
heading steel |
ML10,ML20,ML30,
ML35,ML35CrMo, ML42CrMo,ML15MnB |
1012,1020,1030
1034,4135,4140, 1518 |
SWRCH10R
SWRCH20K SWARCH35K SNB7 |
| Spring steel | 65Mn,60Si2Mn,50CrVA | 1066,6150 | SCP6,SCP10 |
| Bearing steel | GCr15 | E52100 | SUJ2 |
| Stainless steel | 1Cr13,2Cr13 | 412,420 | SUS410,SUS420 |
| Tooling steel |
T8,T10
W6Mo5Cr4V2 |
W1A-8,
W1A-9.5,M2 |
SK7,SK4,SKH9 |
| Free cutting s teel |
Y12,Y12Pb,Y15,
Y15Pb,Y40Mn |
1212,11L08,1215
12L13,12L14,1141 |
SUM21,SUM32,
SUM22L,SUM42... |
| Round steel | Square steel | Flat steel |
| hexagonal steel | Irregular steel | Steel pipe |
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