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There are several annealing processes for wear - resistant castings

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2017-12-14 14:37

Recrystallization annealing is usually referred to as recrystallization annealing because recrystallization occurs once during heating and cooling process. This annealing method is quite common in steel. Steel recrystallization annealing process is slowly heated to Ac1 (eutectoid steel or hypereutectoid steel) more than 30 ~ 50 ℃, keep the appropriate time, and then slowly cooled down, by heating during pearlite (or there are proeutectoid ferrite and cementite) into austenitic phase transformation recrystallization (round) the opposite happened in the process of the cooling and the second round of phase transformation, recrystallization, form the crystal grain more fine, slice layer thicker, organize uniform pearlite (or and eutectoid ferrite and cementite). If the annealing temperature is above Ac3 (subeutectoid steel), the steel will undergo complete recrystallization, which is called complete annealing. If the annealing temperature is between Ac1 and Ac3 (subeutectoid steel) or between Ac1 and Acm (hypereutectoid steel), the steel will undergo partial recrystallization, which is called incomplete annealing. The former is mainly used in the casting of hypoeutectoid steel to eliminate the microstructure defects (such as wechsler microstructure, banded microstructure, etc.), make the microstructure become fine and uniform, so as to improve the plasticity and toughness of steel pieces. The latter is mainly used for medium carbon, high carbon steel and low alloy steel castings. In addition, the annealing temperature between Ac1 and Acm is also incomplete annealing. Spheroidizing annealing will be heated to a temperature of steel castings to begin to form the austenitic temperature above 20 ~ 40 ℃, slow cooling after heat preservation, in the process of cooling of pearlite lamellar cementite into a ball, reducing the hardness.

In the process of casting production, the role of the casting mold is very important. The surface on which the mold cavity is in direct contact with the liquid metal is called the working surface.

2018/01/19 14:38

There are several annealing processes for wear - resistant castings

2017/12/14 14:37

Investment casting is a revival of an ancient craft

Lost wax method casting is now called investment casting, is a little cutting or no cutting casting process, is an excellent technology in the casting industry, its application is very wide. It is not only suitable for casting of various types and alloys, but also can produce castings with higher dimensional accuracy and surface quality than other casting methods.

2017/11/10 14:23

Shandong Mingxing Metal Technology Co., LTD

Shandong mingxing metal Technology co., LTD., formerly known as xintai xiaogang coal mine casting steel factory, was founded in September 1995, and now has nearly 20 years of production history. The company is now located at the foot of taishan xintai high-tech development zone. Adjacent to the beijing-shanghai expressway and beijing-fuzhou expressway, convenient transportation.

2018/07/25 16:52

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Tel/Fax：+865385393589
Mob：+8615092816269
E-mail：mxcasting@163.com
Web：www.mxcasting.cn
Add：No.9 Mingxing road, Xintai city, Shandong province, China.

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