Sichuan Liaofu Special Steel Company is one of the most experienced manufacturers and suppliers of maraging 250 steel round bar in China. With over 20 years' experience, our factory offer high quality products made in China with competitive price. Welcome to contact us for wholesale service.
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 250 is an age hardenable iron-nickel steel alloy melted as VIM + VAR with ultra high strength and toughness. This alloy is easily machinable in the annealed condition prior to final heat treatment.
Maraging 250 is an 18% nickel, cobalt strengthened steel. It is a very high strength material reaching 1800 MPa after heat treatment, has very good toughness with excellent transverse properties. It is produced by Vacuum Induction Melting (VIM) followed by Vacuum Arc Remelting (VAR).
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.
RELATED SPECIFICATIONS
AMS 6512
maraging 250steel chemical composition:
|
C |
Si |
Mn |
S |
P |
Ni |
Co |
Mo |
Ti |
Al |
Cr |
Cu |
|
≤0.030 |
≤0.10 |
≤0.10 |
≤0.01 |
≤0.01 |
17.0/19.0 |
7.0/8.5 |
4.60/5.20 |
0.30/0.50 |
0.05/0.15 |
≤0.5 |
≤0.5 |
after quenching and tempering mechanical property:
|
σb MPa |
|
δ5 % |
Ψ % |
AKv J |
KIC |
HRC |
|
|
≥2255 |
≥2155 |
≥7 |
≥38 |
≥7 |
Actual test |
≥50 |
We also can produce Maraging c300=ams 6514 steel and maraging c250 steel=asm 6512.Please find chemical analyse difference below
Grades of maraging steel
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:
| Element | Grade 200 | Grade 250 | Grade 300 | Grade 350 |
|---|---|---|---|---|
| Iron | balance | balance | balance | balance |
| Nickel | 17.0–19.0 | 17.0–19.0 | 18.0–19.0 | 18.0–19.0 |
| Cobalt | 8.0–9.0 | 7.0–8.5 | 8.5–9.5 | 11.5–12.5 |
| Molybdenum | 3.0–3.5 | 4.6–5.2 | 4.6–5.2 | 4.6–5.2 |
| Titanium | 0.15–0.25 | 0.3–0.5 | 0.5–0.8 | 1.3–1.6 |
| Aluminium | 0.05–0.15 | 0.05–0.15 | 0.05–0.15 | 0.05–0.15 |
| Tensile strength, MPa (ksi) | 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
Heat treatment cycle
The steel is first annealed at approximately 820 °C (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 °C (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)
Company introduction on Youtobe
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