4140 Steel Tubing
SAE 4140
DIN42CrMo4
Delivery conditions:
1.Hot rolled
2.Cold drawn
Products Description
4140 steel is a medium carbon alloy steel, also commonly known as AISI 4140 or SAE 4140. SAE4140 steel is one of the main materials used to produce seamless steel pipes. Here are some product details about 4140 steel tubing:
- Chemical composition: The chemical composition of 4140 steel pipes generally includes:
Carbon (C) 0.38%-0.43%
Silicon (Si) 0.15%-0.35%
Manganese (Mn) 0.75%-1.0%
Chromium (Cr) 0.75%-1.0%
Molybdenum (Mo) 0.15%-0.25%
And a small amount of nickel (Ni) and other elements, phosphorus (P) and sulfur (S) content should usually be controlled at a low level.
- Mechanical properties:
4140 steel tubing have high strength and toughness. After proper heat treatment, it can reach
-Yield strength ≥930MPa
-Tensile strength ≥1080MPa
-Elongation ≥12%
-Sectional shrinkage ≥45%
-Impact energy ≥63J
-Impact toughness value ≥78J/cm²
Its hardness is usually below 217HB.
SAE 4140 Steel Tubing Photos
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Steel Making
Ingot Production
Forged Bars
Machinary
The following is a common production process of 4140 steel tubes:
1.Raw material preparation
Select 4140 alloy steel billets that meet the requirements to ensure that their chemical composition and quality meet the standards.
2.Heating
Put the billet in a heating furnace for heating to reach a suitable rolling temperature, usually between 1100-1250℃.
3.Piercing
The heated billet is punched into a hollow rough tube by a piercing machine.
4.Rolling
The rough tube is rolled using a tube rolling mill to make its wall thickness and outer diameter meet the initial requirements.
5.Sizing or reducing
The outer diameter of the rolled steel pipe is accurately adjusted by a sizing machine or a reducing machine to obtain the specified dimensional accuracy.
6.Heat treatment
The steel pipe is quenched and tempered to improve its mechanical properties and organizational structure. The quenching temperature is generally 840-880℃, followed by tempering, and the tempering temperature is usually 540-680℃.
7.Finishing
Includes straightening, cutting heads and tails, and non-destructive testing (such as ultrasonic testing, eddy current testing, etc.) to ensure the straightness and internal defects of the steel pipe.
8.Surface treatment
According to the needs, surface treatments such as pickling, phosphating, and oiling are carried out to improve the corrosion resistance and appearance quality of the steel pipe.
9.Finished product inspection
The finished steel pipe is subjected to the final quality inspection, including chemical composition analysis, mechanical property testing, dimensional inspection, etc., to ensure that the steel pipe meets the relevant standards and customer requirements.
10.Packaging and storage
The qualified steel pipes are packaged to protect the steel pipes from damage during transportation and storage, and are properly stored.
4140 Steel Tubing Features:
- High strength and toughness: After quenching and tempering, 4140 steel tube shows good comprehensive mechanical properties and is suitable for making parts that need to withstand impact loads.
- Wear resistance and fatigue resistance: The addition of molybdenum and chromium improves the wear resistance and fatigue resistance of steel, making it suitable for manufacturing parts subject to repeated stress.
- Excellent machinability: Although it is a medium carbon steel, it has good machinability and is easy to cut and form.
- 4140 steel pipe has good heat treatment responsiveness, and its hardness and toughness can be adjusted through different heat treatment processes to meet the needs of different applications.
Applications:
Due to its good performance, 4140 steel tube is widely used in many fields, such as the oil and gas industry, the automotive industry, and the machinery manufacturing industry. In the oil and gas industry, it can be used to manufacture drilling equipment, downhole tools, and pipeline accessories; in the automotive industry, it can be used to manufacture engine parts, drive shafts, gears, and chassis parts; in the machinery manufacturing industry, it can be used to manufacture various mechanical parts and tools.
Implementation standards: 4140 steel tubing are usually implemented in accordance with API 5CT, ASTM A519, NACE MR0175, GB/T 8163, etc. Different standards may have different requirements for the chemical composition, mechanical properties, dimensional tolerances, etc. of steel pipes.
It should be noted that the specific product performance and application may vary due to factors such as production process and heat treatment conditions. When selecting and using 4140 steel pipes, it is recommended to refer to relevant standards and technical data, and evaluate and select according to specific needs.
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Packing & Delivery
4140 alloy steel Seamless Tubes Packing & Delivery
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The inner size of container is below:
-- 20ft GP: 5.8m(length) x 2.13m(width) x 2.18m(high)
-- 40ft GP: 11.8m(length) x 2.13m(width) x 2.18m(high)
-- 40ft HG: 11.8m(length) x 2.13m(width) x 2.72m(high)
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