Central Iron and Steel Research Institute

Yanshan University

Handan Xinxing Special Steel Pipes Co. , Ltd.

Hesel Xiongan Kecheng Inspection and Certification Co., Ltd.

Beijing No.6 Construction Engineering Quality Test Department Co., Ltd

Beijing Building Research Institute Corporation Limited of Cscec

Changjun Wang

Jianxiong Liang

Zhenbao Liu

Zhiyong Yang

Xiaohui Wang

Yongqing Sun

Wei Liu

Rui Zhang

Jie Yang

Jie Gao

Xiaoxiao Li

Bo Zhao

Xuewei Zhang

Fuqiang Liu

Chunxu Wang

Hefei Li

Sen Pang

Ailiang Zhang

Yuguang Gao

Dandan Xu

Xupeng Zhang

Yingkun Wang

Xiaohe Gan

Zihang Jiang

Shun Han

Zhiqing Lyu

Le Zhan

An electrically assisted forming process and device for a high-strength metal alloy thin-walled pipe includes a die sleeve, wiring terminals, a pulse power supply, a die seat, sealing baffle plates, a drawing die, and a cooling water circulation chamber. A process for forming a high-strength metal alloy thin-walled pipe includes first, graphite or fusible metal, i.e., an aluminum rod, is introduced into a high-strength metal alloy pipe to be drawn to fill the whole pipe; and then, pulse current is introduced into a plastic deformation area of the thin-walled pipe. A cooling device can be provided to achieve a good cooling effect. The thin-walled pipe with corresponding length is cut according to a production requirement after processing is completed, and annealing treatment is performed in a vacuum heat treatment furnace.

Electrically assisted forming process and device for high-strength metal alloy thin-walled pipe

A hot extrusion die for a special-shaped square pipe includes a die cavity sleeve with a special-shaped cavity. A hot extrusion mandrel is arranged in the die cavity sleeve. An area between the die cavity sleeve and the hot extrusion mandrel forms a die cavity hole. A first extrusion diversion hole and a second extrusion diversion hole are arranged below the die cavity hole. An integral centroid of the die cavity hole is located at a circle center of a radial cross section of the die cavity sleeve. Further disclosed is a hot extrusion integral forming method for a special-shaped square pipe, including: heating and expanding a blank material; heating the blank material again after expanding; performing hot extrusion on the blank material; and cooling the formed special-shaped square pipe in air to a room temperature, and inspecting surface quality and mechanical properties of the special-shaped square pipe.

Hot extrusion die and hot extrusion integral forming method for special-shaped square pipe

A prestressed fish-belly reaction frame, a pile foundation bearing capacity detection device and application thereof, which includes: a core junction; a reaction beam including a plurality of beam units symmetrically arranged around the core junction with the core junction as a center, each beam unit has a first end and a second end, the first end is connected and fixed to the core junction, and the second end is connected and fixed to a pile top of an anchor pile when the pile foundation bearing capacity is detected; a prestressed assembly including a plurality of prestressed tendons, each prestressed tendon passes through an upper end of the core junction, a first end of each prestressed tendon is connected and fixed to the second end of one beam unit, a second end thereof is connected and fixed to the second end of the symmetrical beam unit.

Prestressed fish-belly reaction frame, pile foundation bearing capacity detection device and application thereof

A high-strength stainless steel rotor and a method for preparing the same, are provided. The high-strength stainless steel rotor, including the following element components by mass percentage: C: 0.03-0.050%, Cr: 14.90-15.80%, Ni: 5.00-5.70%, Cu: 2.20-2.80%, (Nb+Ta): 0.35-0.44%, Mo: 0.45-0.54%, V: 0.06-0.10%, Si: 0.20-0.60%, Mn: 0.40-0.80%, P≤0.010%, S≤0.010%, O≤0.003%, and the balance of iron and inevitable impurities.

High-strength stainless steel rotor and method for preparing the same

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Beijing, China

Changjun Wang