A519 Gr.4130 standards applicated in the seamless alloy pipe.
Chromoly is specified by the “SAE” Society of Automotive Engineers. the Alloy elements of 4130 are chromium and molybdenum, this is why its often called chromoly or cromo. Chromoly has an excellent strength to weight ratio, is easily welded and are considerably stronger and harder than standard 1020 mild seamed and DOM tube steels.
The numbers 4130 defines the chemical composition of the steel.
Its performance is much higher than the average of seamless steel tubes, because the steel contains Cr more inside, alloy seamless pipe, its high temperature, low temperature resistance, corrosion resistance is smaller than other seamless.
Especially, it need to do the quenched & tempered and has a high technical requirements. so alloy tube in the petroleum, chemical, electric power, boiler and other industries use more widely.
Chemical composition (%)
| Grade | C | Mn | P | S | Si | Cr | Mo |
| 4130 | 0.28-0.33 | 0.40-0.60 | 0.035 | 0.04 | 0.15-0.35 | 0.80-1.10 | 0.15-0.25 |
- 41 means a low alloy steel containing 1 % chromium and 0.2 % molybdenum.
- 30 means a carbon content of 0.30%.
- In addition there will be around 0.2-0.5 % silicon, 0.5-1.0 % manganese, and under 0.1 % of each of a dozen or so other elements whose presence is unavoidable.
- The remaining 97-98 % is iron.
Mechanical properties (Mpa)
| Grade Designation | Condition | Ultimate Strength | Yield Strength | Elongation in 2 in.or 50mm,% | Rockwell,Hardness B Scale | ||
|---|---|---|---|---|---|---|---|
| ksi | Mpa | ksi | Mpa | ||||
| 4130 | HR | 90 | 621 | 70 | 483 | 20 | 89 |
| SR | 105 | 724 | 85 | 586 | 10 | 95 | |
| A | 75 | 517 | 55 | 379 | 30 | 81 | |
| N | 90 | 621 | 60 | 414 | 20 | 89 | |
4130 chromoly tubing began its first use in the aircraft industry. Race chassis builders began using the tubing for its strength to weight ratio.
4130 tubing is used for anything from bicycle frames, AK-47 receivers, tubular chasis, suspension parts, aircraft parts and air frames etc… Ive used cromo for suspension components, cages / tube chassis and machined parts.
AISI 4130 is a Standard grade Alloy Steel. It is commonly called AISI 4130 Chromium-molybdenum steel. It is composed of (in weight percentage) 0.28-0.33% Carbon (C), 0.40-0.60% Manganese (Mn), 0.035%(max) Phosphorus (P), 0.04%(max) Sulfur (S), 0.15-0.30% Silicon (Si), 0.80-1.10% Chromium (Cr), 0.15-0.25% Molybdenum (Mo), and the base metal Iron (Fe). Other designations of AISI 4130 alloy steel include UNS G41300 and AISI 4130.
Steel is the common name for a large family of iron alloys. Steels can either be cast directly to shape, or into ingots which are reheated and hot worked into a wrought shape by forging, extrusion, rolling, or other processes. Wrought steels are the most common engineering material used, and come in a variety of forms with different finishes and properties. Alloy steels are steels that exceed the element limits for Carbon steels. However, steels containing more than 3.99% chromium are classified differently as stainless and tool steels. Alloy steels also includes steels that contain elements not found in carbon steels such as nickel, chromium (up to 3.99%), cobalt, etc.
The typical elastic modulus of alloy steels at room temperature (25°C) ranges from 190 to 210 GPa. The typical density of alloy steels is about 7.85 g/cm3. The typical tensile strength varies between 758 and 1882 MPa. The wide range of ultimate tensile strength is largely due to different heat treatment conditions.
AISI 4130 steel is a low alloy steel that is used in structural designs that may be found in applications such as aircraft engine mounts or welded tubing. It is well known for its ease of welding and ability to harden in commercial applications. It is commonly referred to as chromium-molybdenum steel.
Application Of 4130 & 4140 Pipe & Pipe Fittings
Uses of 4130 Alloy
- This alloy is used for manufacturing ball and roller bearings.
- This alloy is also good for manufacturing gears due to their heat treatment property.
- It is used for rock-crushing machinery and automotive parts.
- It is used for manufacturing structural parts of aircraft.
- The main use of this alloy is in the field of resistance welding.
- It is used for cutter tools such as drills, taps, milling cutters, etc.
Packing and Marking
- Packed in bundles, wrapped in plastic, and suitably protected for sea-worthy delivery or as requested.
- Marking should according to MIL-STD-129 for Military agencies and in accordance with Fed. Std. No.123 for civil agencies including not limited: Standard, graded, size, heat no. lot no.
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