H型鋼屬于經(jīng)濟(jì)裁面型材(其它還有冷彎薄壁型鋼、壓型鋼板等)，由于截面形狀合理，它們能使鋼材更高地發(fā)揮效能，提高承裁能力。

H steel is an efficient and economical cutting section (other cold-formed thin-walled steel and profiled steel sheets). Because of the reasonable shape of the section, they can make the steel play a more effective role and improve the bearing capacity.

薄板的寬度為500~1500毫米；厚的寬度為600~3000毫米。薄板按鋼種分，有普通鋼、鋼、合金鋼、不銹鋼、工具鋼、耐熱鋼、軸承鋼、硅鋼和工業(yè)純鐵薄板等。

The width of the thin plate is 500~1500 mm, and the thickness is 600~3000 mm. The sheet is divided by steel, including ordinary steel, high quality steel, alloy steel, spring steel, stainless steel, tool steel, heat resistant steel, bearing steel, silicon steel and industrial pure iron sheet.

合金元素與鐵、碳的相互作用

合金元素加入鋼中后，主要以三種形式存在鋼中。即：與鐵形成固溶體；與碳形成碳化物；在高合金鋼中還可能形成金屬間化合物。

The interaction of alloying elements with iron and carbon

When alloy elements are added to steel, they mainly exist in three forms. Namely: to form a solid solution with iron; carbide and carbon; in high alloy steels are also likely to form intermetallic compounds.

有的膠合板是將兩個不同紋路的單板貼在一起制成的，所以在選擇上要注意夾板拼縫處應(yīng)嚴(yán)密，沒有高低不平現(xiàn)象。挑選膠合板時，應(yīng)注意挑選不散膠的膠合板。如果手敲膠合板各部位時，聲音發(fā)脆，則證明質(zhì)量良好，若聲音發(fā)悶，則表示膠合板已出現(xiàn)散膠現(xiàn)象。

Some plywood plywood is made of two different lines of the single board together, so in the choice of the splints should be careful to pay attention to the joint, there is no uneven phenomenon. When choosing plywood, you should pay attention to selecting plywood without glue. If the hand knocks on the plywood parts, the sound is crisp, which proves that the quality is good. If the voice is stuffy, it means that the plywood has already appeared loose glue phenomenon.