Martensitic Steel Castings And Forgings For Mining Mill Parts
1. Introduction to martensitic steel castings and forgings
Luokuang Co., Ltd. specializes in producing wear-resistant castings
in grinding equipment and spindle tiles and tows of various
grinding machines. Its strong casting, forging, heat treatment and
machine adding capabilities, strict quality and process control
methods, perfect testing and experimental means, so that its
production and development of all kinds of wear-resistant products
enjoy a high reputation in China, and exported to overseas.
The microstructure of MS-Martensitic Steel is almost Martensitic
structure. It can be achieved by hot rolling or cold rolling.
Martensitic steel has high tensile strength, and its maximum
strength can reach 1600MPa. It needs to be tempered to improve its
plasticity, so that it still has sufficient formability under such
high strength. It is the highest strength grade of commercial high
strength steel plate at present. Usually can only use rolling
forming production or stamping shape simple parts, mainly used to
form the requirements of the car door anti-collision bar and other
parts to replace tubular parts, reduce manufacturing costs.
2. Martensite castings and forgings stiffness correlation parameters
| Type | Main components(%) | Processing temperature(℃) | Technology processing | Application |
| Martensitic stainless steel | Chromium content 13%～18% | | Quench and temper | Steam turbine blades (lower carbon), medical and surgical tools,
measuring tools, springs, etc. (higher carbon) |
| Martensite precipitation hardening stainless steel | | 400～500℃ | High temperature solution, quenching | Chemical pressure vessel, aircraft structure |
| Martensitic heat resistant steel | Chromium content 7.5%～20.5% | 650～700℃ | Tempering | It is mainly used for valves, turbine blades, nozzles, bolts, etc |
| Maraging steel | The content of nickel is 18% ~ 25%, molybdenum 5%, cobalt 8% and a
small amount of titanium and aluminum | 480℃ | Solid solution of air cooling | Rocket engine casings, aircraft landing gear, important molds |
This kind of steel is in the Y-phase region at normal quenching
temperature, but its Y-phase is stable only at high temperature,
and the M point is generally about 300℃, so it is transformed into
martensite when cooled.
This type of steel includes 2Cr13,2Cr13Ni2,3Cr13 and some
modifications of 12% chromium hot strength steel, such as
13Cr14NiWVBA, Cr11Ni2MoWVB steel and so on. The mechanical
properties, corrosion resistance, process properties and physical
properties of martensitic stainless steel are similar to those of
ferritic-martensitic stainless steel containing 12 ~ 14% chromium.
Because there is no free ferrite in the structure, the mechanical
properties of the steel are higher than those of the above
mentioned steel, but the heat sensitivity of the heat treatment is
lower.
