After several years of development, Sichuan Liaofu Special Steel Industry Co., Ltd mainly produce die steel, high alloy steel smelting, refining, forging, machining, heat treatment of high-quality goods, and formed complete production management system, our company is a private enterprise, the hometown of abrasive tool steel production in China - hubei, the transportation is convenient, the factory has international advanced production equipment, product quality testing equipment.
Maraging steels c300 form a class of iron alloys. This group of materials has a martensitic crystal structure and is strengthened via
aging at approximately 500 ℃ (900 ℃F), hence the name 'maraging'. These ultra-low carbon alloys have very high strength and
hardness properties derived from precipitation of intermetallic compounds rather than carbon content.
Nickel is the main alloying element, with cobalt, molybdenum, and titanium as secondary intermetallic alloying metals.
Maraging steel M300 is also commonly referred to as 1.2709
Maraging 300 is an age hardenable (maraging) iron nickel stainless steel. Maraging 300 has exceptional strength, toughness and is resistant to crack propagation. Maraging 300 is used for tooling, transmission shafts, autosport components and light aircraft landing gear.
AMS 6514
UNS K93120
maraging 300 steel chemical composition:
|
C |
S |
P |
|||||||||
|
<=0.030 |
<=0.10 |
<=0.10 |
<=0.01 |
<=0.01 |
18.0/19.0 |
8.50/9.50 |
4.60/5.20 |
0.50/0.80 |
0.05/0.15 |
<=0.5 |
<=0.5 |
|
σb |
|
δ5 % |
Ψ % |
J |
|||
|
>=2255 |
>=2155 |
>=7 |
>=38 |
>=7 |
>=50 |
We also can produce Maraging c300=ams 6514 steel and maraging c250 steel=asm 6512.Please find chemical analyse difference below
Maraging steels are usually described by a number (e.g., SAE steel grades 200, 250, 300 or 350), which indicates the approximate nominal tensile strength in thousands of pounds per square inch (ksi); the compositions and required properties are defined in US military standard MIL-S-46850D.[8] The higher grades have more cobalt and titanium in the alloy; the compositions below are taken from table 1 of MIL-S-46850D:
| Grade 200 | Grade 250 | Grade 300 | Grade 350 | |
|---|---|---|---|---|
| 17.0–19.0 | 17.0–19.0 | 18.0–19.0 | 18.0–19.0 | |
| 8.0–9.0 | 7.0–8.5 | 8.5–9.5 | 11.5–12.5 | |
| 3.0–3.5 | 4.6–5.2 | 4.6–5.2 | 4.6–5.2 | |
| 0.15–0.25 | 0.3–0.5 | 0.5–0.8 | 1.3–1.6 | |
| 0.05–0.15 | 0.05–0.15 | 0.05–0.15 | 0.05–0.15 | |
| 1,379 (200) | 1,724 (250) | 2,068 (300) | 2,413 (350) |
That family is known as the 18Ni maraging steels, from its nickel percentage. There is also a family of cobalt-free maraging steels which are cheaper but not quite as strong; one example is Fe-18.9Ni-4.1Mo-1.9Ti. There has been Russian and Japanese research in Fe-Ni-Mn maraging alloys
The steel is first annealed at approximately 820 ℃ (1,510 ℃F) for 15–30 minutes for thin sections and for 1 hour per 25 mm (1 in) thickness for heavy sections, to ensure formation of a fully austenitized structure. This is followed by air cooling or quenching to room temperature to form a soft, heavily dislocated iron-nickel lath (untwinned) martensite. Subsequent aging (precipitation hardening) of the more common alloys for approximately 3 hours at a temperature of 480 to 500 ℃ (900 to 930 ℃F) produces a fine dispersion of Ni3(X,Y) intermetallic phases along dislocations left by martensitic transformation, where X and Y are solute elements added for such precipitation. Overaging leads to a reduction in stability of the primary, metastable, coherent precipitates, leading to their dissolution and replacement with semi-coherent Laves phases such as Fe2Ni/Fe2Mo. Further excessive heat-treatment brings about the decomposition of the martensite and reversion to austenite.
Newer compositions of maraging steels have revealed other intermetallic stoichiometries and crystallographic relationships with the parent martensite, including rhombohedral and massive complex Ni50(X,Y,Z)
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