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2. 41xx steel - Wikipedia

   en.wikipedia.org/wiki/41xx_steel

   41xx steel is a family of SAE steel grades, as specified by the Society of Automotive Engineers (SAE). Alloying elements include chromium and molybdenum, and as a result these materials are often informally referred to as chromoly steel (common variant stylings include chrome-moly, cro-moly, CrMo, CRMO, CR-MOLY, and similar).

3. Cold-formed steel - Wikipedia

   en.wikipedia.org/wiki/Cold-formed_steel

   Cold-formed welded and seamless high-strength, low-alloy structural tubing with improved atmospheric corrosion resistance A847 50 70 1.40 19 Zinc-5% aluminum alloy-coated steel sheet by the hot-dip process A875 SS Gr. 33 33 45 1.36 20 Gr. 37 37 52 1.41 18 Gr. 40 40 55 1.38 16 50 Class 1 50 65 1.30 12 50 Class 3 50 70 1.40 12 HSLAS Type A 50 50 60

4. Steel grades - Wikipedia

   en.wikipedia.org/wiki/Steel_grades

   4140/4142: 41CrMo4 42CrMo4 42CrMoS4 43CrMo4: 708M40 708A42 709M40 En19 En19C: 41CrMo4 ... API Tubing and Casing: H40 None None or black band at the manufacturer's ...

5. ASTM A500 - Wikipedia

   en.wikipedia.org/wiki/ASTM_A500

   ASTM A500 is a standard specification published by the ASTM for cold-formed welded and seamless carbon steel structural tubing in round, square, and rectangular shapes. It is commonly specified in the US for hollow structural sections, but the more stringent CSA G40.21 is preferred in Canada.

6. List of commercially available roofing materials - Wikipedia

   en.wikipedia.org/wiki/List_of_commercially...

   Roofing material is the outermost layer on the roof of a building, sometimes self-supporting, but generally supported by an underlying structure. A building's roofing material provides shelter from the natural elements. The outer layer of a roof shows great variation dependent upon availability of material, and the nature of the supporting ...

7. Hollow structural section - Wikipedia

   en.wikipedia.org/wiki/Hollow_structural_section

   Rectangular and square HSS are also commonly called tube steel or box section. Circular HSS are sometimes mistakenly called steel pipe, although true steel pipe is actually dimensioned and classed differently from HSS. (HSS dimensions are based on exterior dimensions of the profile; pipes are also manufactured to an exterior tolerance, albeit ...