Steel plate for multi-wire submerged arc welding and manufacturing method thereof
A technology of multi-wire submerged arc welding and manufacturing method, applied in the field of metallurgy, can solve problems such as scientific research only, and achieve the effect of improving welding efficiency
Active Publication Date: 2020-06-30
YANSHAN UNIV
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Problems solved by technology
Using this technology to produce steel plates is slightly less difficult than oxide metallurgy technology, but because of the aging problem of N, there is no steel plate produced by this technology in any domestic project, and this technology is limited to laboratory scientific research
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Embodiment Construction
[0034] The present invention will be further described below in conjunction with the examples, but not limited to the following examples.
[0035] The present invention refines 7 batches of test steel in a vacuum furnace of 50 kg. The composition is as shown in Table 3, cast into an ingot, and rolled into a 25 mm thick steel plate by using the TMCP process shown in the present invention. The specific rolling process is as shown in Table 4. Wherein, the steel plate in Example 7 is tempered at 550° C. for 45 minutes. The mechanical properties of the trial steel plates are shown in Table 5. The mechanical properties meet the requirements of steel plates of various strength levels from Q235 to Q550. The impact energy at -40°C is above 250J, and the impact energy of aging at -40°C is also above 250J. After aging, the toughness decreases little, and the aging sensitivity coefficient C is below 4%. .
[0036] The rolled 25mm steel plate is made into a 10.5*10.5*85mm Gleeble thermal...
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The invention discloses a steel plate for multiple wire submerged-arc welding and a manufacturing method thereof. The steel plate comprises following chemical components in percentage by weight: 0.02to 0.12% of C, 0.05 to 0.30% of Si, 0.70 to 1.80% of Mn, not more than 0.012% of P, 0.001 to 0.010% of S, 0.015 to 0.050% of Al, 0.010 to 0.060% of Nb, 0.005 to 0.020% of Ti, 0.0005 to 0.0020% of B, not more than 0.0050% of N, 0.0005 to 0.0020% of Ca, not more than 0.050% of RE, and the balance being iron and inevitable impurities; and following relationship should be satisfied: 0.60<=C / Ceq+Mn / 10Ceq+12(Ti+RE)+80B<=1.10, Mn / (S / Ca)<=5.0, wherein Ceq=C+Mn / 6+(Cr+Mo+V) / 5+(Ni+Cu) / 15. A TMCP technology is adopted to manufacture the steel plate, and the steel plate is tempered at a temperature of 500to 650 DEG C. The provided manufacturing method can solve the problem that under large work line energy (50-200 kJ / cm), the impact toughness of the heat affected zone of a base material is degraded, and moreover, the welding efficiency is improved by times.
Description
technical field [0001] The invention belongs to the field of metallurgy, and relates to a wide and thick plate of ultra-low carbon micro-alloy high-strength steel and a manufacturing method thereof, in particular to a steel plate for multi-wire submerged arc welding and a manufacturing method thereof. Background technique [0002] With the development of steel structures such as modern bridges, buildings, ships, pipelines, and containers in the direction of large-scale, high-parameter, safety, and durability, the importance of high-efficiency welding technology has become increasingly prominent. Among several common high-efficiency welding methods such as multi-wire submerged arc welding, narrow gap submerged arc welding, gas-electric vertical welding and electroslag welding, multi-wire submerged arc welding is used more, and twin-wire submerged arc welding is used more. application is more common. Traditional welding methods such as single-wire submerged arc welding and ga...
Claims
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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C38/08C22C38/16C21D8/02
CPCC21D8/0205C21D8/0226C21D8/0247C22C38/002C22C38/005C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16
Inventor 王青峰王同良魏旭洪君白福臣
Owner YANSHAN UNIV