RU2217520C2 - Steel - Google Patents

Abstract

FIELD: metallurgy; production of steels for manufacture of crane booms at cargo-hoisting capacity of up to 50 t mounted on automobile chassis for operation under adverse climatic conditions. SUBSTANCE: proposed steel contains the following components, mass- %: carbon, 0.10-0.16; manganese, 0.5-0.8; silicon, 0.8-1.1; chromium, 0.6-0.9; nickel, 0.5-0.8; copper, 0.4-0.8; molybdenum, 0.10-0.20; vanadium, 0.02-0.07; boron, 0.0010.004; aluminum, 0.02-0.06; calcium, 0.001-0.005; the remainder being iron at the following relationship: V = (0,22-C)/2)±0,01 and Ca = (Al+0,02/20)±0,001, where V is content of vanadium; C is content of carbon; Ca is content os calcium; Al is content of aluminum, mass-%. EFFECT: improved strength characteristics; possibility of performing welding jobs without preliminary heating. 2 cl, 5 tbl

Description

 Tables

Claims (2)

1. Steel containing carbon, manganese, silicon, chromium, nickel, copper, iron, characterized in that it additionally contains molybdenum, vanadium, aluminum, boron, calcium in the following ratio of ingredients, wt.%: Carbon 0.10-0.16 Manganese 0.5-0.8 Silicon 0.8-1.1 Chrome 0.6-0.9 Nickel 0.5-0.8 Copper 0.4-0.8 Molybdenum 0.10-0.20 Vanadium 0.02-0.07 Boron 0.001-0.004 Aluminum 0.02-0.06 Calcium 0.001-0.005 Iron Else with the following ratios:

and

V is the content of vanadium, wt.%; C is the carbon content, wt.%; Ca - calcium content, wt.%; Al is the aluminum content, wt.%. 2. Steel according to claim 1, characterized in that the content of the ingredients satisfies the ratios:

and Al = 10B = 0.01, where B is the boron content, wt.%.

Images