SU931790A1 - Steel composition - Google Patents

Description

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The invention relates to metallurgy, more specifically to structural low-alloy steels. Steel is known, containing HP, wt.;: Carbon 0.05-0.12 Manganese 1.2-2.0 Silicon 0.1.5-0.60 Vanadium 0 ,, 12 Niobium 0.01-0.08 Molybdenum. 0.005-0.13 Aluminum 0.01-0.06 Nickel 0.02-0.50 Chromium 0.02-0.50 Nitrogen0.008-0.025 Calcium 0.001-0.03 Cerium 0.002-0.0 Iron Rest Nearest to the proposed by. the technical essence and the achieved effect is steel 2, containing weight; 0.1–0.25 Carbon 0.1–1.6 Manganese is available to chlorine of op VI from those 0.1-0.52 Silicon 0.05–0.35 0,, 15 Vanadium 0.005–0.1 0.005 –0.06 Aluminum 0.001–0.07 Calcium, 0.05–0.5 Nickel 0.05–0, 0.01–0.2 Niobium 0.01–0.3 Zirconium Iron Else This steel is in delivery condition at sufficiently high values of the strength characteristics, it does not have a high durability, determined by the absolute value of the impact toughness, which is collected on samples with sharp air at negative temperatures, the amount of viscous component in ohms of full-scale samples of DVTT during operation of the product. The chain of the invention is to increase the coolness of steel. 3 To achieve the delivered steel, containing carbon, silicon, vanadium, niobium, chromium, nickel, calcium, zirconium and gel additionally contains cerium, the following ratio of components, weight 5 & 0.07-0.1 Carbon 1,2- 2.0 Manganese o.2-d; b Silicon Vanadium 0.03-0.10 Niobium 0.01-0.05 0.01-0.30 0.01-0.50 0.01-0.30 Nickel 0.001-0.020 Calcium 0.002-0.030 Zirconium 0.001-0.020 Iron Else The proposed steel has a trace of mechanical properties when delivered after rolling control: Tread limit 58 kg / mm / gness Current limit 5 kg / mm honor

The content of chemical elements,% 0,072,0О ,, 10 0,040,3 0,10 1,7 1,7 0,60,07 0,050,2 О, Ml 1,2 0,2,0,0,01,010,1

 The content in all swimming trunks. Sulfur up to 0.01%, phosphorus to 0.02%.

Table 1 Elongation 22% Impact viscosity KCV -15 8 kgm / cm Viscous composition on DVTT samples at -15 ° C 85% in induction furnaces are smelted and industrial variants of the proposed steel are tested. The casting is carried out in the usual way into ingots, which are forged on the billets and, using controlled rolling modes, the billets are rolled onto a sheet of thickness T mm. Strength characteristics are determined on round specimens made according to GOST 1 97-B1, and percussion GOST 9 5 "-78. In tab. 1 shows the variants of the proposed steel in table. 2 mechanical properties of the proposed and known steels. 0,010,010,0200,0080,002 0,020,300,0100,0300,010 0,300,500,0010,001,0,020

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"By comparing the properties of fine and proposed steel tested under the same conditions, it can be seen that the proposed steel has a higher cold resistance with sufficiently high strength characteristics, which leads to an increase in the reliability and service life of the main gas-oil pipeline a meter operated in the North. The economic effect of more than 250000 rubles. in year.

Claims (1)

1. USSR author's certificate H- 652235, cl. C 22 C, 1979. . USSR Author's Certificate in Application fT 2789796/02, cl. C 22 C 38/50, 1979. It also contains the following ratio in the following weight%: ponents ratio. O, 07-0, U Carbon Manganese 1.2-2.0 Silicon 0.2-0.6 0.03-0.10 Vanadium Niobium 0.01-0.0 Chromium 0.01-0.30 0, 01-0.50 Copper Nickel 0.01-0.30 0.001-0.020 Calcium Zirconium 0.002-0.030 Cerium 0.001-0.020 Iron Rest