I want to know the application of SKD61 steel. Also its German and US equivalent.?

Question

I work with a machine shop. A customer is asking us to use SKD61 or equivalent to make tooling for them. I appreciate if any friends here can kindly tell me what is the characteristic and application area of SKD61 and also the part no of its German and US equivalent.

Answer 1

The core is made of a material having a thermal expansion coefficient of more than 3.8.times.10.sup.-6 /.degree.C. at 20.degree. C., and preferable materials have a thermal expansion coefficient higher than molybdenum or molybdenum base alloy, that is, a thermal expansion coefficient higher than 4.8.times.10.sup.-6 /.degree.C. at 20.degree. C. and 7.4.times.10.sup.-6 /.degree.C. at 1300.degree. C. Such a material include hot tool steels represented by SKD61, a superalloy such as Nimonic or Ninowal and ceramics having a great strength at a high temperature such as TiB.sub.2 or ZrO.sub.2. The core having the unevenness is formed with the machining method of cutting a billet, the casting method or the powder metallurgy method of molding and then sintering a powder. In the case that the core is made of a material having a thermal expansion coefficient of more than molybdenum and provided with rectangular grooves, owing to the cuttings in the longitudinal direction, a compressive stress generates on the interface at the side walls of the grooves between molybdenum and the core by the difference of the thermal expansion coefficients of them during cooling after HIP treatment. Thereby, both members are strongly joined by shrinkage fitting. On the other hand, in the case of conventional plugs coated with molybdenum, a great tensile stress generates on the interface between molybdenum and the core in the longitudinal direction due to the difference of the thermal expansion coefficients of them during the cooling to break the plugs.

BOHLER W302 SUPERIOR® (Premium AISI H13) Hot Work Tool Steel.
(Subcategory: Alloy Steel; Ferrous Metal; Hot Work Steel; Metal; Tool Steel

Key Words: DIN 1.2344; JIS SKD61; 40CrMoV5.)
PL. VISIT:
http://www.matweb.com/search/SpecificMaterial.asp?bassnum=NBUCOR10
http://www.matweb.com/search/SpecificMaterial.asp?bassnum=NBUCOR09