What is the chemical composition of 30Mn2

30Mn2 belongs to the national standard alloy structural steel, the implementation standard: GB T 3077-201530Mn2 has medium plasticity during cold deformation, and the machinability and weldability are acceptable, but the parts need to be preheated to more than 200 before welding. The wire drawing, cold heading and heat treatment process has good performance, high hardenability, critical quenching diameter in oil, and small quenching deformation, but there are overheating, decarburization sensitivity and tempering brittleness.

The steel has high strength, toughness and wear resistance after quenching and tempering, and the static strength and fatigue strength are also good. This kind of steel is mostly used in the quenched and tempered state, and is mostly used as stamping parts (4 11 mm steel plates) to manufacture girders, beams, gearbox gears, shafts, cold heading bolts, and quenched and tempered parts with larger cross-sections in automobiles, tractors and general machinery manufacturing. In addition, this steel can also be used as carburizing steel to make carburized parts with high core strength requirements, such as mining crane rear axles and journals.

The chemical composition of 30mn2 is shown in the figure below

Chemical Composition: Carbon C:

Silicon si:manganese mn:

Sulfur S: Permissible residual content

Phosphorus p: permissible residual content

Chromium Cr: Permissible residual content

Nickel Ni: Permissible residual content

Copper Cu: Permissible residual content

30mn2 alloy structural steel.

Standard: GB T 3077-2015

Features and scope of application:

After quenching and tempering, it has high strength, toughness and wear resistance, and good static strength and fatigue strength. It is used as an important fastener for small cross-section, which can be used as frame longitudinal beam, gearbox gear, shaft, cold heading bolt and quenching and tempering parts of larger cross-section; In mining machinery, carburized parts with high central strength requirements, such as crane rear axles and journals.

Chemical Composition: Carbon C:

Silicon si:manganese mn:

Sulfur S: Permissible residual content

Phosphorus p: permissible residual content

Chromium Cr: Permissible residual content

Nickel Ni: Permissible residual content

Copper Cu: Permissible residual content

Mechanical Properties: Tensile Strength B (MPa): 785(80)Yield Strength S (MPa): 635(65)Elongation δ5 (12.)

Section shrinkage 45

Impact power AKV (J): 63

Impact toughness value kv (j cm2): 78(8)hardness: 207hb

Specimen size: The specimen blank size is 25mm

Heat treatment specifications and metallographic structure:

Heat treatment specification: quenched 840, water cooled; Tempered 500, water-cooled.

Delivery Status: Delivered in heat-treated (normalized, annealed or high-temperature tempered) or without heat-treated, the delivery status should be indicated in the contract.

What is the material of 30mn2 steel?

30Mn2 steel chemical composition: C, Si

Mechanical properties of 30mn2 steel: tensile strength 785MPa, yield strength 635MPa, elongation after fracture 12%, expansion and contraction rate after fracture 45, impact absorption work 63J

30mn2 is a relatively common alloy structural steel, it is a medium carbon quenched and tempered manganese steel with carbon content and manganese elements.

30mn2 steel characteristics.

Its strength, plasticity and wear resistance are high, machinability and heat treatment process performance are relatively good, but it is easy to crack during heat treatment, there is white spot sensitivity, cold deformation plasticity is not high, weldability is poor, and preheating is required before welding.

Uses of 30mn2 steel.

It is commonly used in the manufacture of tractor frames, gears, bearings, cold heading bolts and quenched and tempered parts with large cross-sections. It can also be used to make carburized parts with high core strength requirements, such as crane axles and journals.

Grade: 20mnb

Chemical composition (wt% %)

cr≤ni≤

CU Reference standard: Notation of the name, use, characteristics and process method of steel products of high-quality carbon structural steel (extracted from GB T 699-1999) (extracted from GB T 221-2000).

20Mn2 belongs to the national standard alloy structural steel, and the implementation standard: GB T 3077-2015

20mn2 has moderate intensity. High plasticity during cold deformation, good low temperature performance, acceptable weldability and machinability. Compared with carbon steel with corresponding carbon content, its hardenability is higher, and the critical hardening diameter in oil is up to 4 15 mm, but it has a tendency to overheat, decarburization and tempering brittleness during heat treatment.

It is used to manufacture carburized parts with low requirements for the surface and core, and the cross-sectional diameter is <50mm, such as carburized pinions, small shafts, piston pins, cross pin heads, diesel engine sleeves, valve ejector rods, gearbox levers, steel sleeves, etc. In addition, this steel can also be used to make riveting and weldments, screws, nuts, etc. in the hot-rolled and normalized state.

The chemical composition of 20mn2 is shown in the figure below

Carbon C: Silicon Si:

Manganese phosphorus p:

Sulfur : Chromium Cr:

Nickel ni:

Copper cu:

Chemical Composition: Carbon C:

Silicon Si: Manganese Mn: Sulfur S: Hu Mao

Phosphorus p: source to do grip.

Chromium cr:

Nickel ni: hail celebration

Copper cu:

Chemical Composition:

Carbon C: Silicon Si:

Manganese mn:sulfur s:

Phosphorus p: chromium cr:

Nickel ni:

Copper cu: