4140 q&t steel properties / 4140 Quenched and tempered steel
Quenched and tempered SAE-AISI 4140 is SAE-AISI 4140 steel in the quenched and tempered condition. It has the highest strength compared to the other variants of SAE-AISI 4140 steel. The graph bars on the material properties cards below compare quenched and tempered SAE-AISI 4140 to: SAE-AISI wrought steels (top), all iron alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.
4140 alloy steel material is a high quality Quenched and Tempered Alloy Structural steel, It belong to the high quality medium carbon alloy steel, Oil Quenched & Tempered Hardenss is 28-34 HRC.4140 Annealing delivery hardenss less than 250HB
Supply Size range
| Delivery condition |
Diameter ranges |
| Hot tolled |
M12-M310 |
| Hot rolled+Q&T(Quenched and tempered) |
M12-M310. |
| Cold drawn +Q&T(Quenched and tempered) |
M10-M100 |
| Peeled / Peeled+Q&T |
M10-M100 |
| Forge |
|
AISI 4140 equivalent material
♦JAPAN♦ : JIS SCM440 alloy steel
♦GERMANY♦ : DIN WN-r 1.7255 / 42CrMo4 steel alloy
♦CHINA♦ : GB 42CrMo steel
♦BRITISH♦ : BS 708M40
AISI 4140 alloy steel Chemical composition
| ASTM A29/29M |
C |
Si |
Mn |
Cr |
Mo |
P |
S |
| 4140 |
0.38~0.43 |
0.15~0.35 |
0.75~1.00 |
0.80~1.10 |
0.15~0.25 |
≤0.035 |
≤0.040 |
| DIN WN-r |
C |
Si |
Mn |
Cr |
Mo |
P |
S |
| 1.7225 |
0.38~0.45 |
≤0.40 |
0.60~0.90 |
0.90~1.20 |
0.15~0.30 |
≤0.035 |
≤0.035 |
| GB/T |
C |
Si |
Mn |
Cr |
Mo |
P |
S |
| 42CrMo |
0.38~0.45 |
0.17~0.37 |
0.50~0.80 |
0.90~1.20 |
0.15~0.25 |
≤0.030 |
≤0.030 |
| BS |
C |
Si |
Mn |
Cr |
Mo |
P |
S |
| 708M40 |
0.36~0.44 |
0.10~0.35 |
0.70~1.00 |
0.90~1.20 |
0.15~0.25 |
≤0.035 |
≤0.035 |
| JIS |
C |
Si |
Mn |
Cr |
Mo |
P |
S |
| SCM440 |
0.38~0.43 |
0.15~0.35 |
0.60~0.85 |
0.90~1.20 |
0.15~0.30 |
≤0.030 |
≤0.030 |
AISI 4140 Mechanical property (Chinese standard )
We can catch different property as per your requirements
| Tensile Strength |
Yield Strength |
Elongation |
Reduction |
Impacting Energy |
HBW |
| Rm,MPa |
Rel,MPa |
A,% |
Z,% |
Aku,J |
≤ |
| |
|
|
|
|
After annealing |
| ≥1080 |
≥930 |
≥12 |
≥45 |
≥63 |
217 |
Quality control
1.Processing Line:
Iron - hot metal pretreatment - Converter - Refining --VD / RH- - Continuous Casting - Hot Rolling (KOCKS) - heat --UT Check - Processing and Distribution Center
Electric Furnace - Refining --VD / RH- - Continuous Casting - Hot Rolling (KOCKS) - heat --UT Check - Processing and Distribution Center
2.Gas content level:O2 - <20 ppm H2 - <2 ppm N2- <100 ppm
3.Grain Sizes:5-8
Delivery time of steel bar
7-10days of stock,30 days after order confirmed for new produced .
steel bar Inspection:
Spectral Tested, Microstructure Tested,Hardness Test,Macrostructure Test,UT test and so on.
Mark: Heat Number,Weight,Sizes,Grade,etc
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