国产精品久久久久久久久久久久久久久久久_亚洲人成影视在线观看_看全黄大色黄大片美女爽一次_国产精品高潮呻吟久久_国产精品久久网站_av无码免费岛国动作片片段

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
主站蜘蛛池模板: 亚洲狠狠婷婷综合久久久 | 毛片黄片一级片 | 国模无码大尺度一区二区三区 | www.九九热.com | 亚洲国产一区二区三区四区四季 | 日产精品久久久一区二区开放时间 | 日韩一区二区欧美 | 无遮挡刺激激动做爰高潮网站 | 欧美乱码精品一区二区 | 在线观看久久久久久 | 人成在线免费视频 | 久草视频在线看 | 欧美一区二区三区婷婷月色 | 国产伦精品免费视频 | 亚洲 欧美 精品 | 欧美特黄特色三级视频在线观看 | 日本在线中文字幕一区 | 草久视频在线 | 在线不卡一区二区 | 亚洲伊人国产 | 国产一级片av大片 | 精品毛片乱码1区2区3区 | 奇米在线视频 | 麻豆视频在线免费观看 | 午夜视频在线 | 偷窥自拍五月天 | 亚洲午夜国产成人 | 青青青国产精品一区二区 | 亚洲精品乱码久久久久久蜜桃不爽 | 精品看片| 91 在线视频 | 4虎最新 | 亚洲乱码日产精品一二三 | 日韩精品一区二区三区在线 | 免费看黄色大全 | 国产午夜精品福利 | 日本不卡一二区 | 日韩视频1区 | 91欧美激情一区二区三区成人 | 久久久久久久久亚洲精品杨幂 | 精品视频国产 |