36results about How to "Uniform thermal stress" patented technology

The invention discloses a plate shape control method of high-strength steel for a longitudinal beam of a commercial vehicle. The plate shape control method comprises the following steps that: 1) a hotblank is charged into a furnace; 2) the plate blank is heated; (3) rough rolling is conducted, specifically, a 1+5 rolling mode is adopted, bending amount of a C-shaped bend or an S-shaped bend in the last pass is controlled within +/-10mm, wedge shape control range is controlled within +/-20[mu]m, and rough rolling finishing temperature is controlled within 1040-1080 DEG C; (4) finish rolling isconducted, specifically, outlets of F1-F4 racks adopt large convexity value control, F5-F7 racks adopt an equal-proportion convexity control mode, and convexity control range of a finished product is0-20[mu]m; 5) layer cooling is conducted, specifically, a front-section ultrafast cooling and rear-section air cooling mode is adopted; 6) slow cooling is conducted, specifically, preheating is conducted in advance in a heat preservation wall, and a steel coil is hoisted into the heat preservation wall for slow cooling; and 7) straightening and flattening are conducted. According to the plate shape control method of the high-strength steel for the longitudinal beam of the commercial vehicle, the high-strength steel for the longitudinal beam of the commercial vehicle prepared is good in apparent plate shape, has no potential plate shape risk, and completely meets the high-standard requirement of a rolling forming process of the high-strength steel for the longitudinal beam of the commercial vehicle on the plate shape.

The invention discloses a plate shape control method for steel for a hot-rolled high-strength stirring tank body. The plate shape control method comprises the following steps that (1) hot blanks are charged; (2) plate blanks are heated; (3) rough rolling is conducted, specifically, a 1+5 rolling mode is adopted, the bending amount of C-shaped bending or S-shaped bending of the last pass is controlled within +/-10mm, the wedge-shaped control range is within +/-20[mu]m, and the rough rolling ending temperature is controlled to be 1040-1080 DEG C; (4) finish rolling is conducted, specifically, large convexity value control is adopted for outlets of F1-F4 racks, an equal proportion convexity control mode is adopted for F5-F7 racks, and the finished product convexity control range is 0-30[mu]m;(5) layer cooling is conducted, specifically, a front-section ultra-fast cooling and rear-section air cooling mode is adopted; (6) slow cooling is conducted, specifically, preheating is conducted ina heat preservation wall in advance, and steel coils are discharged from a production line and hoisted into the heat preservation wall for slow cooling; and (7) straightening and flattening are conducted. The steel for the hot-rolled stirring tank body is prepared according to the plate shape control method, the apparent plate shape of a material is good, the warping amount during discharging cutting is less than or equal to 5mm, and the requirements of the welding process of an automobile concrete stirring tank body for the plate shape are completely met.