Joist steel and production method thereof
A production method and steel technology, applied in metal rolling, manufacturing tools, metal processing equipment, etc., can solve the problems of large amount of joist welding, many joist welding points, and many hidden safety hazards, and achieve the reduction of welding points and reduction. Welding workload, uniform shape effect
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Embodiment 1
[0049] Such as image 3 As shown, this embodiment provides a joist steel, including a steel body, the steel body is integrally formed, the steel body is solid, has strong load-bearing and deformation resistance, and the cross-sectional shape of the steel body along its length direction is the same.
[0050] The cross section is a symmetrical structure, and the cross section has a transverse central axis 301 and a longitudinal central axis 302 perpendicular to each other.
[0051] The cross section includes a first deformation portion and a second deformation portion, the first deformation portion and the second deformation portion are symmetrical along the transverse central axis 301; the first deformation portion includes a first arc portion 401, a second arc portion 402 and a first Connecting portion 403, one side of the outer edge of the first arc-shaped portion 401 of the first deformation portion is connected to the same side of the outer edge of the first arc-shaped port...
Embodiment 2
[0059] Such as Figure 4 As shown, the present embodiment provides a joist steel production method for producing the steel in Example 1, comprising the following steps:
[0060] Step 1: Select the continuous casting slab.
[0061] The continuous casting billet with a square cross section is selected as the continuous casting billet. The material of the continuous casting billet is joist steel 235 steel. The joist steel 235 steel has good plasticity and welding performance, and has good forming ability and is easy to roll into the target shape.
[0062] Step 2: Heating the continuous casting slab.
[0063] The continuous casting slab is heated to 1050-1100°C in the heating furnace, so that the rolling start temperature of the continuous casting slab is 1020±15°C. The continuous casting slab can be put into the furnace either cold or hot.
[0064] Step 3: Roughly rolling the continuous casting billet, rolling the continuous casting billet into a cylindrical primary round bill...
Embodiment 3
[0089] This embodiment is consistent with the steps of implementation 2, and is used for rolling a steel body with a diameter of 16mm in the circular A, and the specific steps are as follows:
[0090] Step 1: Select the continuous casting slab.
[0091] The billet selected in this step is a continuous casting billet with a section of 150mm×150mm and a length of 12000mm.
[0092] Step 3: Roughly rolling the continuous casting billet, rolling the continuous casting billet into a cylindrical primary round billet.
[0093] The sixth rough rolling pass is rolled into a round billet with a diameter of 70mm, with a height tolerance of ±0.3mm and a width tolerance of -0.6~+0.2mm.
[0094] Step 4: The sixth pass of intermediate rolling is rolled into a round billet with a diameter of 37.5mm, the height dimension tolerance is ±0.15mm, and the width dimension tolerance is -0.3~+0.1mm;
[0095] Step 502: Roll the round billet into a round billet with a diameter of 30 mm in the second pa...
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