彎曲度：工字鋼高度小于或等于400MM時，每米彎曲度不得大于1.5MM，總彎曲度不得大于總長度的0.15%。高度大于400MM時，每米彎曲度不得大于1.0MM，總彎曲度不得大于總長度的0.1%。

Bending degree: when the height of the I-steel is less than or equal to 400MM, the bending degree of each meter must not be more than 1.5MM, and the total bending degree should not be more than 0.15% of the total length. When the height is greater than 400MM, the bending degree of each meter must not be more than 1.0MM, and the total bending degree should not be more than 0.1% of the total length.

H型鋼的翼緣都是等厚度的，有軋制截面，也有由3塊板焊接組成的組合截面。工字鋼都是軋制截面，翼緣內邊有1：10坡度。

Ｈ型鋼的軋制不同于普通工字鋼僅用一套水平軋輥，由于其翼緣較寬且無斜度(或斜度很小)，故須增設一組立式軋輥同時進行輥軋。

The flange of the H steel is equal thickness, has a rolling cross section, and a  section of 3 plates. The I-steel is the rolling section, and the inner edge of the flange has the 1:10 gradient.

The rolling of H steel is different from ordinary I-beam only with a set of horizontal rolls. Because of its wide flange and no slope (or very small slope), a group of vertical rollers should be set up and rolled at the same time. 

細木工板握螺釘力好，強度高，具有質堅、吸聲、絕熱等特點，而且含水率不高，在10%—13%之間，加工簡便，用途為廣泛。

The woodworking board has good grip strength, high strength, strong quality, sound absorption, insulation and other characteristics, and water content is not , between 10% - 13%, easy processing, the most widely used.

細木工板比實木板材穩(wěn)定性強，但怕潮濕，施工中應注意避免用在廚衛(wèi)。

細木工板的加工工藝分機拼和手拼兩種，手工拼制是用人工將木條鑲入夾板中，木條受到的擠壓力差，不能據(jù)切加工，只適宜做部分裝修的子項目，如做實木地板的墊層毛板等。

Blockboard is more stable than solid wood, but it is afraid of humidity. In ctruction, it should be avoided in kitchen and toilet.

The processing technology of the carpenter board is divided into two kinds. The manual spelling is to insert the wooden bar into the splint, the squeezing pressure of the wooden bar is poor, it can not be cut by cutting, it is only suitable for the subproject of partial decoration, such as the cushion coat of the solid wood floor.