1 high manganese steel (wear-resistant steel) refers to alloy steel with manganese content above 10%. This steel contains manganese 10% ~ 15%, and the carbon content is relatively high, generally 0.90% ~ 1.50%, and most of it is 1.
The temper of manganese steel is very strange and interesting: if 2.5-3.5% manganese is added to the steel, the low manganese steel will be as brittle as glass and will break when knocked. However, if more than 13% manganese is added to make high manganese steel, it will become hard and tough. When high manganese steel is heated to light orange, it becomes very soft and easy to process.
It has no magnetism and will not be attracted by magnets. At present, manganese steel is widely used to manufacture buckets, rails and bridges of steel mills, ball bearings, bulldozers and excavators.
Extended data:
Manganese steel is a kind of high strength steel, which is mainly used to withstand severe working conditions such as impact, extrusion and material wear. The failure mode is mainly wear and partly fracture deformation. Now it is widely used in engine lower guard plate.
Manganese steel is a kind of high-strength wear-resistant steel, which is mainly used in severe working conditions such as impact, extrusion and material wear. The failure forms are mainly abrasion and fracture deformation.
Austenitic manganese steel is the main casting wear-resistant steel and wear-resistant steel. Low alloy steel with proper heat treatment also has good effect under certain conditions, while graphite steel is used for lubrication and friction conditions.
Wear-resistant high manganese steel is especially suitable for impact abrasive wear and high-stress grinding abrasive wear, and is often used to manufacture impact-resistant and wear-resistant castings, such as ball mill linings, hammer crushers, jaw plates of jaw crushers, mortar walls and crushing walls of cone crushers, bucket teeth and walls of excavators, railway switches, tractor and tank track plates, etc. High manganese steel is also used for bulletproof steel plates and safety steel plates.
High manganese steel is a typical wear-resistant steel, and its as-cast structure is austenite plus carbide. After water quenching at 1000℃, the microstructure is transformed into single austenite or austenite with a small amount of carbide, but the toughness is improved, so it is called water toughening treatment.
The most important feature of high manganese steel is that under strong impact and extrusion conditions, the surface layer rapidly undergoes work hardening, so that the hardened layer has good wear resistance while maintaining good toughness and plasticity of the central austenite. This is beyond the reach of other materials. However, the wear resistance of high manganese steel is superior only when there are enough conditions to form work hardening, and it is poor in other cases.
Typical Mn 17 wear-resistant high manganese steel is based on Mn 13 steel, which improves the stability of austenite and prevents the precipitation of carbide, thus improving the strength and plasticity of steel, and improving the work hardening ability and wear resistance of steel. For example, the service life of ZGMn 18 railway forks used in the north is 20%~25% longer than that of ZGMn 13.
wear-resistant steel
This steel contains manganese 10% ~ 15%, and the carbon content is relatively high, generally 0.90% ~ 1.50%, and most of them are above 1.0%. Its chemical composition is (%):
c 0.90 ~ 1.50 Mn 10.0 ~ 15.0
Si0.30 ~1.0s ≤ 0.05p ≤ 0.10 is the most widely used high manganese steel, which is often used to manufacture shovel teeth of excavators, rolling walls of cone crushers, jaw crushers, ball mill linings, railway switches, plate hammers and hammers.
International numbering
① chemical components are represented by international symbols and domestic symbols of chemical elements, and their contents are represented by Arabic letters: China-Russia12crni3a; ;
(2) The steel series or numbers are expressed by fixed digits: United States, Japan, 300 series, 400 series and 200 series;
(3) The serial number is composed of Latin letters and sequences, and the serial number only indicates the purpose.
China coding system
(1) Use element symbols
② Uses: Chinese pinyin, open hearth steel: P, boiling steel: F, killed steel: Z, grade A steel: A, T8: Te8, GCr 15: ball.
◆ Composite steel and spring steel, such as 20CrMnTi 60Si2Mn (C content is expressed in parts per ten thousand).
◆ Stainless steel and alloy tool steel (C content is expressed in thousandths), such as: 1Cr 18Ni9 thousandth (i.e. 0. 1%C), stainless C≤0.08%, such as 0Cr 18Ni9, and ultra-low carbon C ≤ 0.
Identification method
The American Iron and Steel Association uses three numbers to represent various standard grades of malleable stainless steel. Among them: ① Austenitic stainless steel is marked with 200 and 300 series numbers, such as some common austenitic stainless steels marked with 20 1, 304, 3 16 and 3 10.
② Ferritic and martensitic stainless steels are represented by 400 series numbers.
③ Ferritic stainless steels are labeled 430 and 446, and martensitic stainless steels are labeled 4 10, 420 and 440C, which are dual-phase (austenite-ferrite).
④ Stainless steel, precipitation hardening stainless steel and high alloy with iron content less than 50% are usually named by patent names or trademarks.
References:
Baidu Encyclopedia-High Manganese Steel? Baidu encyclopedia-manganese steel