男人插女人骚视频,波多野结衣人妻厨房大战,亚洲国产精品成人精品无码区,亚洲 欧美 国产 综合首页

發票說明：本店標價，都是不包括稅點；開票另加稅點，詳細咨詢客服！

注：關于本產品標題，由于商品標題搜索功能的特性，為方便采購方的購物搜索，所起標題關鍵詞僅適用于搜索功能，不涉及廣告宣傳和功能描述。

溫馨提示：由于現貨市場浮動較大，店鋪所有規格均為參考價格，具體報價請電議咨詢客服，謝謝！

冷彎型鋼指用鋼板或帶鋼在冷狀態下彎曲成的各種斷面形狀的成品鋼材。冷彎型鋼是一種經濟的截面輕型薄壁鋼材，

也稱為鋼制冷彎型材或冷彎型材。冷彎型鋼是制作輕型鋼結構的主要材料。它具有熱軋所不能生產的各種特薄、形狀合理而復雜的截面。

與熱軋型鋼相比較，在相同截面面積的情況下，回轉半徑可增大50～60％，截面慣性矩可增大0.5～3.0倍，因而能較合理地利用材料強度；

與普通鋼結構（即由傳統的工字鋼、槽鋼、角鋼和鋼板制作的鋼結構）相比較，可節約鋼材30～50％左右。C型鋼是指采用高強度鋼板，經過冷彎，

輥壓成型，具有壁厚均勻、截面性能優良，強度高，和傳統熱軋相比同等強度可節約材料30%一種新型鋼材。

Cold curved steel refers to the finished steel of various section shapes made with steel plate or strip steel bent in a cold state.

Cold curved steel is an economical section of light thin wall steel, also known as steel refrigeration bent profile or cold bent profile.

Cold-curved steel is the main material for making light steel structure. It has a variety of extremely thin,

reasonably shaped and complex cross-sections that hot rolling cannot produce. Compared with hot-rolled steel,

the rotary radius increases under the same section area by 50~60% and the section inertia moment by 0.5~3.0 times,

so the material strength can be used with ordinary steel structure. C-type steel refers to the use of high-strength steel plate, after cold bending,

roll pressure forming, with uniform wall thickness, excellent section performance, high strength, compared with the traditional hot rolled,

the same strength can save 30% of the material of a new type of steel.