Shandong Weichuan Metal Prodducts Co., Ltd.

Warranty sales of 4130 alloy steel pipe manufacturer

Short Description:

4130 structural steel has high strength and toughness, high hardenability, and the critical hardening diameter in oil is 15~70mm; the thermal strength of steel is also good, with sufficient high temperature strength below 500℃, but at 550℃ Its strength decreases significantly; when the alloy element is at the lower limit, the welding is quite good, but when the alloy element is close to the upper limit, the weldability is medium, and it needs to be preheated to above 175℃ before welding; the machinability of steel is good, and the plasticity during cold deformation is medium; The range of 300~350℃ has the first type of temper brittleness; there is a tendency to form white spots. This kind of steel is usually used in the quenched and tempered state. When the carbon content is the lower limit, the steel can also be used as a carburizing steel that requires a higher core strength. In the medium-sized machinery manufacturing industry, it is mainly used to manufacture quenched and tempered parts with large cross-sections and working under high stress conditions, such as shafts, spindles, and high-load control wheels, bolts, studs, gears, etc.; in the chemical industry Used to manufacture welded parts, welded structures composed of plates and pipes, and high-pressure pipes that work in a nitrogen-hydrogen medium with a temperature not exceeding 250°C; used in the manufacturing of steam turbines and boilers to make fasteners that work below 450°C, Flanges and flange covers subject to high pressure below 500°C.
Carbon C: 0.28~0.33
Silicon Si: 0.15~0.35
Manganese Mn: 0.40~0.60
Sulfur S: allowable residual content ≤0.040
Phosphorus P: allowable residual content ≤0.035
Chromium Cr: 0.80~1.10
Nickel Ni: allowable residual content ≤0.030
Copper Cu: allowable residual content ≤0.030
Molybdenum Mo: 0.15~0.25
Tensile strength σb (MPa): ≥930(95) Yield strength σs (MPa): ≥785(80)
Elongation δ5 (%): ≥12
Reduction of area ψ (%): ≥50
Impact energy Akv (J): ≥63
Impact toughness value αkv (J/cm2): ≥78(8)
Hardness: ≤229HB
Sample size: sample blank size is 25mm
Heat treatment specification: quenching at 880°C, water cooling, oil cooling; tempering at 540°C, water cooling, oil cooling.

Product Detail

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30CrMo alloy steel pipe has carbon content of 0.26 ~ 0.34, silicon content of 0.17 ~ 0.37, manganese content of 0.40 ~ 0.70, molybdenum content of 0.15 ~ 0.25, chromium content of 0.80 ~ 1.10. There are both relations and differences between alloy pipe and seamless pipe, which cannot be confused. Alloy pipe is defined as steel pipe according to the production material (i.e. material). As the name suggests, it is a pipe made of alloy; Seamless pipe is defined according to the production process of steel pipe (seamless seam). What is different from seamless pipe is seamless pipe, including straight seam welded pipe and spiral pipe. 35CrMo, 16-50mn, 27SiMn, 40Cr, Cr5Mo 12Cr1MoV 12Cr1MoVG 15CrMo 15CrMoG 15CrMoV 13CrMo44 T91 27SiMn 25CrMo 30CrMo 35crmov 40CrMo 45crmo 20g Cr9Mo 10CrMo910 15Mo3 a335p11. P22.p91. T91, steel research 102, st45.8-111, A106B.

Steel grade, abbreviated as steel grade, is the name of each specific steel product. It is a common language for people to understand steel. In China, the rigid sign is generally expressed by the combination of Chinese Pinyin letters, chemical element symbols and Arabic numerals.

Next, we will introduce the meaning of elements and symbols in alloy steel

Warranty sales of 30CrMo alloy steel pipe manufacturer

The two digits at the beginning of the steel grade represent the carbon content of the steel, expressed as a few thousandths of the average carbon content, such as 40Cr.

The main alloying elements in steel, except for individual microalloyed elements, are generally expressed in a few percent. When the average alloy content is less than 1.5%, in the steel grade

Generally, only the element symbol is marked, but the content is not marked. However, if it is easy to be confused under special circumstances, the number "1" can also be marked after the element symbol,

For example, for steel grades "12CrMoV" and "12Cr1MoV", the chromium content of the former is 0.4-0.6%, and that of the latter is 0.9-1.2%, and the other components are all the same

When the average content of alloy elements is ≥ 1.5%, ≥ 2.5%, ≥ 3.5%... The content shall be indicated after the element symbol, which can be expressed as 2 and 3 accordingly


Alloy (2 sheets)

Etc. For example, 18Cr2Ni4WA.

Vanadium V, titanium Ti, aluminum Al, boron B, rare earth RE and other alloy elements in steel belong to microalloyed elements. Although the content is very low, they should still be in the steel grade

Mark. For example, in 20mnvb steel, vanadium is 0.07-0.12% and boron is 0.001-0.005%.

High quality steel shall be marked with "a" at the end of the steel grade to distinguish it from general high quality steel.

For alloy structural steel for special purpose, the steel grade is preceded by (or suffix) to represent the symbol of the purpose of the steel. For example, 30CrMnSi steel for riveting screw,

The steel grade is indicated as ml30crmnsi.

For professional low alloy high strength steel, it shall be indicated at the end of the steel grade. For example, 16Mn steel, the special steel used for bridges is "16Mnq", steam

The special steel grade of girder is "16MnL", and the special steel grade of pressure vessel is "16MnR".

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