CN102586676A

CN102586676A - Rare earth-containing high-strength steel plate for manufacturing wind power tower, and rolling method of steel plate

Info

Publication number: CN102586676A
Application number: CN2012100765729A
Authority: CN
Inventors: 高志国; 程德富; 温利军; 康利明; 李海英; 石晓霞
Original assignee: Baotou Iron and Steel Group Co Ltd
Current assignee: Baotou Iron and Steel Group Co Ltd; Inner Mongolia Baotou Steel Union Co Ltd
Priority date: 2012-03-22
Filing date: 2012-03-22
Publication date: 2012-07-18

Abstract

The invention provides a rare earth-containing high-strength steel plate for manufacturing a wind power tower, and a rolling method of the steel plate, belonging to the field of metallurgical technology. The invention relates to a molding process technology which is characterized in that a slab comprises the chemical components by weight percent: 0.05-0.1% of C, 0.25-0.45% of Si, 1.2-1.4% of Mn, less than or equal to 0.015% of P, less than or equal to 0.008% of S, 0.01-0.03% of Nb, 0.01-0.09% of RE, more than or equal to 0.01% of Al t and the balance Fe and trace impurity elements which can not be detected. According to the rolling technology of the high-strength steel plate, the heating temperature is 1220-1250 DEG C, the heat preservation time is 1-8hours, the rough rolling temperature is 1050-1150 DEG C, the finish rolling temperature is 900-930 DEG C, the final rolling temperature is 850-890 DEG C, and the overall reduction of the two sections of rolling is more than or equal to 75%. The steel plate is excellent in mechanical performance, wherein the yield strength is more than or equal to 390MPa, the elongation is 23-30%, and the yield ratio is less than or equal to 0.86.

Description

A kind of manufacturing wind-power tower that contains rare earth is with high tensile steel plate and rolling method thereof

Technical field

The invention belongs to field shaping technique, particularly hot-rolled steel plate technology.

Background technology

Wind energy receives the concern and the attention of national governments day by day as a kind of novel green regenerative energy sources.Along with the fast development of global wind-powered electricity generation cause, national emphasis wind-powered electricity generation constructions of base such as the Inner Mongol, three provinces in the northeast of China, Qinghai, Gansu, Xinjiang, Shandong, Jiangsu are maked rapid progress.But because wind field is built the abundant place of wind regime in more, physical environment is extremely abominable, some wind power generating set spare and accessory parts because of various reasons particularly environmental influence such as low temperature be prone to damage, influence blower fan and normally use.At present; Of home make wind-power tower is to carry out selection according to different service temperature zones; Like Q345E-Z25 or Z35 steel plate and S355NL-Z25 or Z35 steel plate (Z25 and Z35 select for use according to customer requirement), require mechanical property to satisfy GB/T 1591-2008 and GB/T 5313-2010 defined.In order to develop the steel of wind-power tower under the severe environmental conditions such as low temperature, humidity, dust storm; This patent discloses a kind of RE alloyed HS wind-power tower with steel plate and rolling method thereof, in the C-Mn-Nb alloy system, adds rare earth and makes sheet material reach purposes of design such as cold-resistant, anti-corrosion, shock resistance.

Summary of the invention

The objective of the invention is to disclose a kind of manufacturing wind-power tower that contains rare earth with high tensile steel plate and rolling method thereof, (weight percent) chemical composition content of its slab should meet: C 0.05%-0.1%, Si0.25%-0.45%; Mn 1.2%-1.4%, P≤0.015%, S≤0.008%; Nb 0.01%-0.03%; RE0.01%-0.09%, Alt>=0.010, surplus is Fe and the micro impurity element that can't detect.

The Heating temperature of slab is 1220-1250 ℃, soaking time 1-8 hour, and 1050-1150 ℃ of roughing temperature, final rolling temperature 900-930 ℃, finishing temperature 850-890 ℃, two sections rolling total reduction >=75%.The product of explained hereafter has excellent mechanical property thus, ys>=390MPa, unit elongation 23-30%, yield tensile ratio≤0.86.

Outstanding advantage of the present invention is that hot-rolled steel sheet not only has high-strength high-plasticity, but also can substitute and reduce the add-on of alloying element through the adding rare earth, economizes on resources, and reduces cost.

Description of drawings

Fig. 1 is the typical gold phase constitution photo of embodiment 1 correspondence.

Embodiment

Below in conjunction with embodiment the present invention is done further detailed explanation.

Embodiment 1:

Put into process furnace with intending rolling slab, (weight percent) chemical ingredients of slab is: C 0.07, and Si 0.3%, and Mn 1.35%; P 0.011%, and S 0.008%, and Nb 0.021%; La 0.03%, and Alt 0.01%, and surplus is Fe and the micro impurity element that can't detect.Slab thickness is 95mm, 1220 ℃ of Heating temperatures, soaking time 2.5 hours.The slab that heats is sent into roughing mill be rolled, 1090 ℃ of roughing temperature.The roughing reduction in pass is 40%.Then, the slab after the roughing is sent into the finishing mill station be rolled, 900 ℃ of final rolling temperatures, 870 ℃ of finishing temperatures.The thickness of steel plate is 12mm after the finish rolling, and its tensile property detected value is seen table 1, and ballistic work is seen table 2, and mechanical property all meets the requirement of GB GB/T 1591-2008.Typical steel plate metallographic structure is as shown in Figure 1, and mean grain size is assessed as 10.5 grades.

Table 1 tensile property detected value

Table 2 ballistic work test value

Claims

1. a manufacturing wind-power tower that contains rare earth is used high tensile steel plate, it is characterized in that chemical ingredients is by weight percentage: C 0.05%-0.1%, Si 0.25%-0.45%; Mn 1.2%-1.4%, P≤0.015%, S≤0.008%; Nb 0.01%-0.03%; RE 0.01%-0.09%, Alt>=0.01, surplus is Fe and the micro impurity element that can't detect.

2. a kind of rolling method that contains the manufacturing wind-power tower of rare earth with high tensile steel plate of characteristic according to claim 1; It is characterized in that Heating temperature is 1220-1250 ℃; Soaking time 1-8 hour, 1050-1150 ℃ of roughing temperature, final rolling temperature 900-930 ℃; Finishing temperature 850-890 ℃, two sections rolling total reduction >=75%.