国产亚洲精品自在久久,野花香社区在线视频观看播放,а√天堂中文在线资源bt在线,日韩人妻高清精品专区

tangshan tiankun metal tool manufacturing co., ltd
搜索
首頁

current location:

Homepage >  News Center: Tips: the industry news is meaningful to update every day
tangshan tiankun metal tools co., ltd News Center

tangshan steel shovel
tangshan steel shovel

luannan county is located in the core area of bohai economic circle and beijing tianjin hebei metropolitan area, with complete infrastructure. luannan county is a famous steel spade production base, with an annual production of more than 300 million steel spades and hardware tools, accounting for 90% of the country's export volume, and an annual export of 80 million us dollars. in recent years, luannan county, hebei province, the "hometown of steel spade", has guided enterprises to increase product research and development, and promoted the development and upgrading of steel spade industry. at present, there are 182 steel spade enterprises in the county, and the products are exported to more than 140 countries and regions.

time:2021.01.11.10:35
quality of steel spade
quality of steel spade

as a kind of common metal products, steel spade is widely used in agriculture, construction and other industries. the quality of steel spade depends on the production process and heat treatment process of steel spade. the heat treatment process of steel includes annealing, normalizing, quenching and tempering and surface heat treatment. tempering includes high temperature tempering, medium temperature tempering and low temperature tempering. tempering is to reheat the quenched steel to a certain temperature and then cool it by a certain method. its purpose is to eliminate the internal stress produced by quenching, reduce the hardness and brittleness, so as to achieve the expected mechanical properties.

time:2021.01.11.10:36
steel shovel town
steel shovel town

luannan county takes the transformation and upgrading, innovation and development as the main line to make the traditional characteristic industry bigger and stronger. through the transformation of mode and structure, it constantly innovates the reform ideas and measures, builds the steel shovel town with high quality, focuses on promoting the high-quality development of the steel shovel industry, and drives the traditional characteristic industry to radiate new vitality. recently, the provincial development and reform commission announced the list of the first batch of characteristic towns in hebei province (jite town lianban [2017] no. 1). luannan county, china steel shovel town on the list of cultivation category.

time:2021.01.11.10:37
无码高潮少妇毛多水多水| 男女性爽大片视频| 精品国产污污免费网站入口| 日本少妇春药特殊按摩3| 色av综合av综合无码网站| 亚洲中文字幕久久无码| 亚洲精品成人网站在线观看| 夜夜躁狠狠躁2021| 无码爽视频| 99久久久无码国产精品6| 欧美粗大无套gay| 久久婷婷国产剧情内射白浆| 免费国产裸体美女视频全黄| 娜娜麻豆国产电影| 中文天堂国产最新| 欧美疯狂性xxxxxbbbbb| 中国a级毛片免费观看| 丰满人妻熟妇乱又伦精品| 国产美女自慰在线观看| 丰满人妻熟妇乱又仑精品| 色综合天天综合欧美综合| 中文字幕无码乱人伦| 国产一区二区女内射| 精品一品国产午夜福利视频| 国产成人精品亚洲日本在线观看| 内射爽无广熟女亚洲| 亚洲精品乱码久久久久久久久久久久 | 18级成人毛片免费观看| 在线观看免费无码专区| 女同性av片在线观看免费网站| 久久婷婷五月综合97色一本一本| 国产精品无码av一区二区三区| 国产va免费精品高清在线| 大胸少妇午夜三级| 日韩精品视频一区二区三区| 亚洲av永久无码精品三区在线4| 九九综合va免费看| 国产在视频线精品视频| 卡一卡二卡三无人区| 中出人妻中文字幕无码| 国产爆乳无码一区二区麻豆|