Martensitic Steel Castings And Forgings With Tensile Strength Of
1600MPa
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 treatment process and use
Martensitic stainless steel, martensitic precipitation hardening
stainless steel, martensitic heat resistant steel and maraging
steel are different according to the composition, heat treatment
process performance and application.
(1) Martensitic stainless steel with chromium content of 13% ~ 18%,
used in quenching and tempering state, used for turbine blades
(with low carbon), medical and surgical tools, measuring tools,
springs, etc. (with high carbon).
(2) Martensite precipitation hardening stainless steel, chromium
nickel content is higher than the former, after high temperature
solution, quenching, and aging treatment at 400 ~ 500℃, in the
martensite matrix precipitated a large number of the second phase
and the matrix of the structure of the structure of chemical
pressure vessels, aircraft, etc.
(3) Martensitic heat-resistant steel contains 7.5% ~ 20.5%
chromium, 0.15% ~ 0.85% carbon and a variety of alloying elements.
It is tempered at 650 ~ 700℃ to form fine carbides dispersed in the
matrix. It is mainly used in valves, turbine blades, nozes and
bolts of automobile engines.
(4) The maraging steel, containing 18% ~ 25% nickel, 5% molybdenum,
8% cobalt and a small amount of titanium and aluminum, is aged at
480℃ after solid solution and air cooling.
Because of the high cost, it is generally used in important
structural parts of aviation, aerospace and ocean technology, such
as rocket engine shells, aircraft landing gear, important molds,
etc.
3. 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 |
