工字钢的边长小，高度大，只能承受单方向的力。H型钢槽深，厚度大，可以承受两个方向的力。工字钢只能用于横梁，而H型钢才能用于结构的承重柱。ThelengthoftheI-steelis***allandhigh.Itcanonlybeartheforceofthesingledirection.TheHsteelgrooveisdeepandthick,andcanbeartheforceoftwodirecti.I-steelcanonlybeusedforcrossbeams,andHsteelcanbeusedforstructurebearingcolumns.型材按生产方法可以分成热轧型材、冷弯型材、冷轧型材、冷拔型材、挤压型材、锻压型材、热弯型材、焊接型材和特殊轧制型材等。型材按其横断面形状可分成简单断面型材和复杂断面型材。简单断面型材的横断面对称、外形比较均匀、简单，如圆钢、线材、方钢和扃钢等。复杂断面型材又称为异型断面型材，其特征是横断面具有明显凸凹分支。Thewidthofthethinplateis500~1500mm,andthethicknessis600~3000mm。细木工板握螺钉力好，强度高，具有质坚、吸声、绝热等特点，而且含水率不高，在10%—13%之间，加工简便，用途为广泛。Thewoodworkingboardhasgoodgripstrength,highstrength,strongquality,soundabsorption,insulationandothercharacteristics,andwatercontentisnot,between10%-13%,easyprocessing,themostwidelyused.胶合板是由三层或多层一毫米左右的实木单板或薄板胶贴热压制成，常见的有三夹板、五夹板、九夹板和十二夹板（俗称三合板，五厘板，九厘板，十二厘板）。Plywoodismadeofthreeormorethanonemillimeterofsolidwoodveneerorthinplatewithhotpressing.Therearethreesplints,fivesplints,ninesplintsandtwelvesplints(commonlyknownasthreeplywood,fivemillimeter,ninemillimeter,twelvemillimeter).)