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1, steel classificationHardness: partial volume inside the steel surface to resist foreign objects pressed into the ability to produce plastic deformation, is a measure of the degree of soft and hard steel.By Carbon Content: Low Carbon (C <0.25), carbon steel (C = 0.25-0.6%), high carbon (C> 0.6%)According to the quality points: ordinary steel, high quality steel, high-grade steelBy incorporation of alloy content: low-alloy steel (alloy content <5%), the alloy (alloy amount of 5-10%), high-alloy steel (alloy volume> 10%)BY PURPOSE: structural steel, tool steel, special steelOn civil engineering is commonly used in low carbon steel and low alloy steel2, the technical nature of the steel① affect the chemical composition of carbon, silicon, manganese, phosphorus, sulfur, oxygen, nitrogen steel performance② process performance include: cold bending properties, weldability③ mechanical properties:⑴ tensile strength: low carbon steel by pulled from breaking through flexibility, yield enhancement, necking four stages.⑵ toughness: steel shock load capability.⑶ fatigue resistance: In the alternating load under the action repeatedly, within the prescribed period in the base can withstand the maximum stress fracture does not occur.3, cold steel reinforcement, aging treatment and welding① arc welding, contact welding② strain aging, natural aging, artificial aging③ civil engineering carried out at room temperature with steel cold-drawn, cold drawn, cold-rolled, to produce plastic deformation, increase the yield strength, lower ductility
And toughness.4, steel corrosion and corrosion① anti-corrosion measures: alloying, metal coating, non-metallic covering② There are two types of chemical corrosion and electrochemical corrosion.5, construction steel, steel and selection criteria① civil engineering structural steel⑴ same kind of steel, open-hearth steel and steel than BOF converter steel air; special killed steel is superior killed steel, killed steel is better than semi-killed steel, excellent
In boiling steel.⑵ low carbon steel: steel grades by letter on behalf of the yield strength, yield strength values lower quality rating symbols, symbols and other four deoxy degree
Composition parts.② Steel steel: hot-rolled steel (angles, L-beam, I-beam, channel, H-beam), cold-formed steel, steel pipes and steel (seamless steel pipe
Welded steel pipe, hot rolled steel, cold rolled steel, tread plate)③ steel reinforced concrete: hot rolled steel, cold-rolled ribbed [CRB550 (for non-prestressed concrete), CRB650, CRB800,
CRB970, CRB1170], tendons
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