Heat Treatment 40cr 42CrMo Scm440 SAE 4140 Steel Round Bars
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.
1.4140 Steel chemical composition:
| 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 |
Laiwu Xincheng Metal Co., Ltd. Is a factory to produce cold drawn and heat treated steel bars for manufacturers of high strength bolts, sucker rods, piston rods and engineering machinery axis pins in oil & gas, automotive and construction industrial field.And also the powderful manufacturer of threaded rods, stud bolts ,and so on.
With monthly productivity 3000 tons , our markets are all over the world such as the United of Emirates, Saudi Arab, Oman, South Korea, Vietnam, Malaysia, India, Pakistan, New Zealand, Australia, Italy, Romania, the United states, Argentina etc.
Capability from Raw material to processing to final products under one Roof . Highest customer satisfactionEconomy of products Absolute reliability Highly-qualified and motivated personnel No tolerance of errorsContinuous optimisation of all processes To stand apart from competition, the company provides unparalleled value added services to its esteemed customers. The company is pledged to honor its commitment for every order and when great products are backed-up by great services, the combination becomes irresistible.
| Products |
Application |
|
Main grades |
| QT steel bar & Cold drawn+QT steel bar |
Stud Bolt |
M10 to M100 3/8" to 4" |
ASTM A 193 Grade B7,B7M ,B8, B8M & B16 |
| ASTM A 320 Grade L7 & L7M |
| grade 4.6,4.8,5.6,5.8,8.8,10.9 and 12.9 |
| Hex Nuts |
M10 to M100 3/8" to 4" |
ASTM A193 B7, B7M, B16, B8, B8M etc. |
| ASTM A320 L7, L7M, B8, B8M |
| Threaded Rods |
M10 to M100 3/8" to 4" |
ASTM A 193 Grade B7,B7M ,B8, B8M & B16 |
| ASTM A 320 Grade L7 & L7M |
| grade 4.6,4.8,5.6,5.8,8.8,10.9 and 12.9 |
| Anchor Bolts |
M10 to M100 3/8" to 4" |
grade 4.6, 4.8, 5.6, 5.8, 8.8, 10.9 and 12.9 |
| A 193 B7 & B16, ASTM A 320 L7 |
| ASTM A 193 Grade B8 & B8M |
| ASTM A 675 Grade 90, ASTM A 572 Grade 50, |
| ASTM F1554 grade 36, 55 and 105 |
Process for Steel round bar
Blast Furnance→ Molten Iron Pretreatment→Converter→LF→VD/RH→ContinuousCasting→Hot Rolling(KOCKS)→ Heat Treatment→ UT Inspection→Finish Product
EAF→LF→VD/RH→ Continuous Casting→Hot Rolling(KOCKS)→ Heat Treatment→ UT Inspection→ Finish Product
| Grade |
Tensile Strength |
Yield Strength |
Elongation |
Reduction |
-40ºCAkv2/J |
Hardness |
| Mpa |
Mpa |
% |
% |
| 10.9 |
≥1040 |
≥940 |
≥9 |
≥48 |
≥50 |
HRC32-39 |
| 8.8 |
≥830 |
≥660 |
≥12 |
≥52 |
≥70 |
HRC23-34 |
Machining
AISI 4140 has good machinability. Operations such as turning, hobbing, drilling, sawing, broaching, tapping and milling can be easily performed using the recommendations provided by the machine's manufacturer for ideal tool type-feeds and speeds. AISI 4140 has the following properties:
Machinability rating at 66% of B1112
Average cutting speed of 110 ft/min.
Capability from Raw material to processing to final products under one Roof .
Highest customer satisfaction
Economy of products
Absolute reliability
Highly-qualified and motivated personnel
No tolerance of errors
Continuous optimisation of all processes
Audited Supplier 
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