SU730868A1 - Steel - Google Patents

Description

The invention relates to metallurgy, namely, steels resistant to corrosion cracking in solutions with hydrogen. Closest to the proposed steel l, containing, weight. 0.12-0.21 Carbon Manganese 0.7-1.0 Silicon 0, 35, 0.4-O, 65 Molybdenum 0.15-0.25 Vanadium 0, OZ-O, O8 0.01-0, 03 0, ОО05-О, ОО Aluminum 0, О2О-О, О6О 0.08-0.02 Iron Else However, this steel does not have high resistance to corrosion damage in hydrogen sulfide-containing medium. The purpose of the invention is to increase the risk of hydrogen sulfide-containing corrosion to corrosion cracking. . The goal is achieved by the fact that steel 1 &, coagulating carbon, manganese, molybdenum, chromium, silicon, titanium, aluminum, and eso, additionally contains antimony, earth, metals, following the ratio of components, weight. %: 0.08-0.15 Carbon O, ZO-0.60 Manganese 0.10-0.50 Molybdenum O, O01-0, OO5 1.0-3.0 0.30-0.70 Silicon 0, 05-0.15 Aluminum 0, 0, Antimony Rare-Earth O, O1-O, O9 metals Else. Iron Testing of the proposed step-by-step determination of standard mechanical characteristics and resistance to rosion cracking in a water-containing medium in melts containing upper, lower and average values of the alloying components. Melting number 1 (lower limit), weight. %: carbon Op08j manganese 0.32j 0.11; boron 0,001; antimony 0.01; chromium 1.0 silicon 0.32; titanium 0.05; aluminum O, 05; rare earth elements 0.0Ij iron and impurities else. Melting Nfe 2 (top gfedel), wt.%: Carbon 0,15; manganese 0.59; molybdenum 0.50; boron 0,005; antimony 0.30; chromium 2.97; silicon 0,7 O; titanium 0.15; aluminum 0.10; rare earth metals 0.09; iron and impurities else. Samples containing the average value of the alloying elements are not tested, since experiments have shown that the steels with the average strength of the alloying elements in terms of resistance to corrosion cracking and in terms of standard mechanical characteristics of 7,684 coincide with upper or lower limits. The corrosion cracking test is carried out in a solution imitating aqueous salt-forming solutions with hydrogen sulphide (3% ACI-v 3000 mg / l + HX S 100 mg / l CHjCOOH. Cylindrical specimens with a length of 120 mm, diameter 10 mm with con - Voltage centralizer (notch depth 1 mm, radius at the crack tip 0.1 mm). The test specimens are made of the proposed steel, hardened from 1050s into water, followed by tempering at. The results of standard mechanical tests are shown in Table 1, the results tests in hydrogen sulfide containing medium pr voltage of 75 kg / mm - 2.t in Table, Table 1.

+ 10% CHjCOOH

Water solution

3% A / aCe + + zooo mg / l -% OCHA

Upper vanity

Not destroyed

5OO

176 Disruption of the sample

)

Sample breaking for comparison {similar tests for known steel. Lower limit, weight ..%: carbon 0.1 manganese O, 71 | silicon 0,22 chromium 0.41 | O, 17j vanadium O, 03j titanium O, O If boron 0.00 OS J aluminum O, 02O | nitrogen 0.08} Iron else. Upper limit, weight. %: carbon 0.21 | manganese 1.02; silicon 0.34 | chromium 0.66j molybdenum 0.25j vanadium 0, titanium 0, OZ | boron O, O05J aluminum 0.06 nitrogen 0.020 | ; the remaining iron, Samples made from steel, are destroyed due to corrosion cracking after an average of 200 hours (parallel testing of the wire ± on 2 samples of each heat, while samples made of the proposed steel withstand the tests for 500 hours. Steel is technological during smelting , well processed. The data presented testify to the high resistance of the proposed steel against corrosion cracking in saline-saturated solutions containing hydrogen sulfide. containing carbon, manganese, molybdenum, boron, chromium, silicon, titanium, luminium and iron, characterized in that, in order to increase the sensitivity to corrosion cracking in hydrogen sulfide-containing environments, it additionally contains antimony and earth metals at the next ratio of the components, wt. 0.08-0.15 Carbon 0.30-0.60 Manganese Molybdenum 0.10-0.50 0.001-0.005 1.0.0 Silicon 0, ZO-O, 7O 0.05-0.15 0.05 -0.10 Aluminum 0.01-0.30 Antimony Rare-Earth O, 01-0, O9 metals Iron Else. Sources taken into account in the EIA, taken into account during examination 1, US Patent No. 3664830, L. 75-124, 1972.

Claims (1)

Claim Steel containing carbon, manganese, molybdenum, boron, chromium, silicon, titanium, 5 aluminum and iron, characterized in that, in order to increase resistance to corrosion cracking in hydrogen sulfide-containing media, it additionally contains antimony and 10 rare-earth metals in the following ratio of components , weight. %: Carbon 0.08-0.15 Manganese 0.30-0.60 Molybdenum 0.10-0.50 fifteen Boron 0.001-0.005 Chromium 1.0-3.0 Silicon 0.30-0.70 Titanium 0.05-0.15 Aluminum 0.05-0.10 20 Antimony Rare earth 0.01-0.30 metals 0.01-0.09 Jelly eo Else ·