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Alta Special Steel Co.,Ltd
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ALTA SPECIAL STEEL is specialized in supplying and exporting tool steel, mold steel and alloy steel, especially for FORGED BARS D2/1.2379/SKD11, H13/1.2344/SKD61, O1/1.2510/SKS3, A2, 1.2367, 1.2767
ALTA SPECIAL STEEL is specialized in supplying and exporting tool steel, mold steel and alloy steel, especially for FORGED BARS D2/1.2379/SKD11, H13/1.2344/SKD61, O1/1.2510/SKS3, A2, 1.2367, 1.2767

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Meaning of "Argon Oxygen Decarburization (AOD) Process"

Argon oxygen decarburization (AOD) is a process primarily used in production of stainless steel and other high grade alloys such as silicon steels, tool steels, nickel-base alloys and cobalt-base alloys with oxidizable elements such as chromium and aluminum. AOD was invented in 1954 by the Lindé division of The Union Carbide Corporation, which became Praxair in 1992. An AOD converter is shown in Fig 1. ....

More please kindly move to : http://www.altaspecialsteel.com/news/Argon-Oxygen-Decarburization-AOD-Process-80.html

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Rerserach on Microstructure and Properties of Cr12MoV / X12MΦ after Heat Treatment

Abstract: After spheroidizing annealing / quenching and tempering treatment as preheat treatment and the same vacuum heat treatment as final heat treatment, the microstructure, hardness, impact toughness, bending strength and wear resistance of Cr12MoV steel were studied. The results indicate that the quenching and tempering treatment as preheat treatment, instead of spheroidizing annealing, has more benefits for the variation of carbide morphology, size and distribution, and can effectively improve properties of Cr12MoV, like hardness, impact toughness, bending strength and wear resistance. After vacuum heat treatment, the impact toughness and bending strength of the samples reach 8.654 J·cm-2 and 2201.4 Mpa, respectively, In comparison to the samples with spheroidizing annealing, They increase 13.5% and 39.3%, Respectively.


Read more, please visit : http://www.altaspecialsteel.com/news/Rerserach-on-Microstructure-and-Properties-of-Cr12MoV-after-Heat-Treatment-79.html
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The research of improving the smelting quality of D2 steel


[Abstract] The effect of forging ratio and ingot size on the eutectic carbide inhomogeneity of D2 forged bars and the effect of refining process and the surface state of electrode on the oxygen content have been studied. Results show that the forging ratio and ingot size have significant influence on eutectic carbide inhomogeneity of D2, namely the grade of eutectic carbide inhomogeneity of D2 forged bars made by Ø 1100mm ESR ingot decreases with increase of forging ratio at the range of 2 to 8, while the grade of eutectic carbide inhomogeneity ....


More please visit at : http://www.altaspecialsteel.com/news/The-research-of-improving-the-smelting-quality-of-D2-steel-78.html
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Gear steel is a general term for steel that can be used for producing gears. The existence of oxides and sulfides in the steel, harmful elements such as nitrogen, hydrogen, oxygen etc will reduce the mechanical properties and performance of steel, thus produce bad affecting the service life of automobile carburized gears.

Gears are generally manufactured by following steels
1.Low-carbon steel e.g., 1020
2.Low-carbon-alloy steel 20Cr, 20CrMnTi etc
3.Medium carbon steel : C35, C45 etc
4.Medium carbon-alloy steel : 40Cr, 42CrMo4, 35CrMo etc

More please visit via. http://www.altaspecialsteel.com/news/The-Knowledge-of-gear-steel-77.html
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Gear materials and Heat treatment

It’s essential to select proper material and heat treatments in accordance with the intended application of the gear. Here we lay out few common gear materials for your reference.

No.1 Material selection

1.AISI 1045 / S45C
S45C is one of the most commonly used steel, containing moderate amounts of carbon (0.45% ). S45C / 1045 is easily obtainable and is used in the production of spur gears, helical gears, racks, bevel gears and worms.

More please visit via. http://www.altaspecialsteel.com/news/Gear-materials-and-Heat-treatment-76.html
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How to Choose Mold Steel Rolling Plate and Forging Die Blocks Reasonably

The most famous imported grades e.g., 1.2738, 1.2311, 1.2312, SP300, SP350.. They are pre-hardened forging die blocks.

While, what’s the difference between die blocks and rolled plates ? You will be clear at a glance through its production process.

Die Block : EBT → LF → VD (low the content of [H], down the steel cracks, shrinkage, subcutaneous bubbles and The center loose) → Casting (protection on the argon) → Annealing (Slow cooling) → Ingot finish → Ingot heating → Hydraulic Press forging (3150T) → Heat treatment → Rough milling (four sides) → UT test → Cut ends → Package & Delivery



http://www.altaspecialsteel.com/news/How-to-Choose-Mold-Steel-Rolling-Plate-and-Forging-Die-Blocks-Reasonably-75.html
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Extending Service Life Of H13 Hot Extrusion Dies For Aluminum Alloy By Transverse Forging Technology
It’s found that experimented transverse forging technology to forge H13 hot extrusion dies for aluminum alloy, and succeeded in extending its service life of 1-1.5 times by changing fiber direction and adopting new heat treatment process. More please view below website :
http://www.altaspecialsteel.com/news/Extending-Service-Life-Of-H13-Hot-Extrusion-Dies-For-Aluminum-Alloy-By-Transverse-Forging-Technology-59.html
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Ship SKD11 / 1.2379 / D2 hot rolled flat bars / plates in sand blast surface condition.
Minimum thick 6mm now! Welcome you enquiries at sales@altaspecialsteel.com
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2016/12/19
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The harmful effects of non metallic inclusions and its influence on Metal Properties ?
Due to the existence of non-metallic inclusion in steel, the metallic continuity will be damaged : mechanical character, physical properties, chemical properties and process performance will be decreased. For example, the non-metallic inclusion could lead to stress raisers, as a result of fatigue-induced fracture,
More please visit at : http://www.altaspecialsteel.com/news/The-harmful-effects-of-non-metallic-inclusions-and-its-influence-on-Metal-Properties-58.html
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Mold steel – P20 or not P20?
The venerable mold steel isn’t the only choice for successful injection mold materials...but it’s a stable, solid foundation for a good mold..
Further view please visit http://www.altaspecialsteel.com/news/content-57.html
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2016/11/27
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