CN102936684A - Production method of non-quenched-and-tempered oil-storage-tank-used 12MnNiVR steel plate - Google Patents

Abstract

The invention relates to a production method of a non-quenched-and-tempered oil-storage-tank-used 12MnNiVR steel plate, and relates to the field of oil storage tank steel. The steel plate comprises the chemical components of, by weight: 0.07-0.13% of C, 0.20-0.40% of Si, 1.40-1.60% of Mn, 0.20- 0.40% of Ni, 0.01-0.02% of Ti, 0.04-0.06% of V, 0-0.20% of Mo, 0-0.01% of P, 0-0.005% of S, 0-0.03% of Nb, and balance of Fe and unavoidable impurities. The production method has the advantages that: the steel plate is designed with low carbon and proper amounts of Mn, Cr, and Ni; and a TMCP+tempering heat treatment production technology is adopted, such that steel plate yield strength is higher than 490MPa, a tensile strength is higher than 610MPs, a -20 DEG C low-temperature impact toughness is higher than 200J, and a maximal thickness can reach 50mm. The production method is suitable for large-scale productions.

Description

A kind of non-modified storage tank production method of 12MnNiVR steel plate

Technical field

The present invention relates to storage tank steel making field, particularly a kind of non-modified storage tank production method of 12MnNiVR steel plate

Background technology

According to published patented technology, storage tank all adopts quality adjustment condition delivery with high tensile steel plate both at home and abroad, and cost is higher, and complex manufacturing is difficult to control, increases production difficulty.

Summary of the invention

The object of the present invention is to provide a kind of non-modified storage tank production method of 12MnNiVR steel plate, adopt low-carbon (LC) to add an amount of Mn, Cr and Ni Composition Design, by adopting the production technique of TMCP+ tempering heat treatment, so that the steel plate yield strength is more than 490MPa, tensile strength is more than 610MPa,-20 ℃ of low-temperature impact toughness are more than 200J, and maximum ga(u)ge can reach 50mm, are fit to scale operation.

Non-modified storage tank of the present invention with the chemical component weight per-cent of 12MnNiVR steel plate is: C:0.07 ~ 0.13%, Si:0.20 ~ 0.40%, Mn:1.40 ~ 1.60%, Ni:0.20 ~ 0.40%, Ti:0.01 ~ 0.02%, V:0.04 ~ 0.06%, Mo:0 ~ 0.20%, P:0 ~ 0.01%, S:0 ~ 0.005%, Nb:0 ~ 0.03%, surplus are Fe and inevitable impurity.Its production technique is as follows:

(1) with heating steel billet to 1150 ~ 1220 ℃, guarantee steel billet soaking time 4 ~ 6 hours, improve the homogeneity that heats on the steel billet thickness direction;

(2) steel billet after coming out of the stove is carried out dephosphorize by high pressure water and process, remove the iron scale that blank produces in heat-processed;

(3) steel billet after the dephosphorization is carried out recrystallization zone rolling (roughing) and non-recrystallization district rolling (finish rolling);

At rough rolling step: the rolling temperature interval is controlled in 980 ~ 1100 ℃ of scopes, and cumulative deformation is between 60% ~ 70%, and intermediate blank treats that temperature thickness/finished product thickness is 3 ~ 4;

In the finish rolling stage: the start rolling temperature interval is controlled in 880 ~ 950 ℃ of scopes, and the finishing temperature interval is controlled in 780 ~ 850 ℃ of scopes, and control steel billet total deformation rate is between 70% ~ 80%;

(4) steel plate after the finish to gauge carries out the cooling of ACC laminar flow, and the speed of cooling scope control is in 15 ~ 30 ℃/s scope, and final cooling temperature is controlled in 450 ~ 550 ℃ of scopes;

(5) steel plate carries out air cooling and carry out temper to room temperature, and tempering temperature is controlled in 60 ~ 650 ℃ of scopes, and soaking time is 10 ~ 20 minutes+thickness of slab * 1 minute/mm.

The invention has the advantages that the economical Composition Design that adopts low-carbon (LC) to add an amount of Mn, Cr and Ni, effectively reduce production cost, adopt the production technique of TMCP+ tempering heat treatment, compare with the steel production method with the storage tank of the modified production of routine, the mechanical property of steel plate reaches following level:

(1) tensile property:

Yield strength is more than 520Mpa, and tensile strength is more than 640;

(2) low-temperature flexibility:

-20 ℃ of low-temperature impact toughness are more than 200J, and-60 ℃ of low-temperature impact toughness are more than 150J;

(3) cold-bending property:

Transverse cold bending d=3a (d is bending diameter, and a is steel plate thickness), 180 °, Extrude Face is intact.

Description of drawings

Fig. 1 is steel plate thickness direction surface metallograph after embodiment 1 tempering.

Fig. 2 is steel plate thickness direction 1/4 metallograph after embodiment 1 tempering.

Fig. 3 is steel plate thickness direction heart section metallograph after embodiment 1 tempering.

Fig. 4 is steel plate thickness direction surface metallograph after embodiment 2 tempering.

Fig. 5 is steel plate thickness direction 1/4 metallograph after embodiment 2 tempering.

Fig. 6 is steel plate thickness direction heart section metallograph after embodiment 3 tempering.

Embodiment

Embodiment 1

The production method of non-modified oil storage steel plate for tanks 12MnNiVR according to the present invention, the thickness 16mm steel plate that utilized 4300mm Stand Mill Heavy Plate Rolling Line output, its steel billet chemical ingredients is as shown in table 1, cooling controlling and rolling controlling process is as shown in table 2, it is as shown in table 3 to return technique, and series of temperatures lower steel plate mechanical property is as shown in table 4.

The chemical ingredients of table 1 embodiment (surplus is Fe for weight, %)

C	Si	Mn	P	S	Alt	Ni	V	Nb	Mo	Ti
											0.080	0.30	1.45	0.01	0.002	0.05	0.20	0.051	0.035	0.20	0.015

Table 2 cooling controlling and rolling controlling process

Table 3 tempering process

Thickness	Heating temperature	Soaking time
			16mm	630 ± 10 ℃ of tempering	15±1min

Table 4 series of temperatures lower steel plate mechanical property

Embodiment 2

The production method of non-modified oil storage steel plate for tanks 12MnNiVR according to the present invention, the thickness 32mm steel plate that utilized 4300mm Stand Mill Heavy Plate Rolling Line output, its steel billet chemical ingredients is as shown in table 5, cooling controlling and rolling controlling process is as shown in table 6, tempering process is as shown in table 7, and series of temperatures lower steel plate mechanical property is as shown in table 8.

Table 5 comparative example's chemical ingredients (surplus is Fe for weight, %)

C	Si	Mn	P	S	Alt	Ni	Cr	V	Nb	Mo	Ti
												0.060	0.20	1.45	0.01	0.002	0.02	0.40	0.25	0.051	0.035	0.25	0.015

Table 6 cooling controlling and rolling controlling process

Table 7 tempering process

Thickness	Heating temperature	Soaking time
			32mm	610 ± 10 ℃ of tempering	30±1min

Table 8 series of temperatures lower steel plate mechanical property

By above-described embodiment 1 and embodiment 2 as can be known, the non-modified oil storage steel plate for tanks produced of the present invention

12MnNiVR adopts low-carbon (LC) to add an amount of Mn, Cr and Ni Composition Design, by TMCP+ tempering heat treatment production technique, so that the steel plate yield strength is more than 490MPa, tensile strength is more than 610MPa, and-20 ℃ of low-temperature impact toughness are more than 200J,-60 ℃ of low-temperature impact toughness are more than 150J, reduce the quenching heat treatment operation, reduced cost, excellent performance, be fit to scale operation, can be widely used in the fields such as oil, chemical industry.

Claims (1)

1. a non-modified storage tank is with the production method of 12MnNiVR steel plate, the chemical component weight per-cent of this steel plate is: C:0.07 ~ 0.13%, Si:0.20 ~ 0.40%, Mn:1.40 ~ 1.60%, Ni:0.20 ~ 0.40%, Ti:0.01 ~ 0.02%, V:0.04 ~ 0.06%, Mo:0 ~ 0.20%, P:0 ~ 0.01%, S:0 ~ 0.005%, Nb:0 ~ 0.03%, surplus is Fe and inevitable impurity; Production technique is as follows:

(1) with heating steel billet to 1150 ~ 1220 ℃, guarantee steel billet soaking time 4 ~ 6 hours, improve the homogeneity that heats on the steel billet thickness direction;

(2) steel billet after coming out of the stove is carried out dephosphorize by high pressure water and process, remove the iron scale that blank produces in heat-processed;

(3) steel billet after the dephosphorization is carried out recrystallization zone rolling (roughing) and non-recrystallization district rolling (finish rolling);

At rough rolling step: the rolling temperature interval is controlled in 980 ~ 1100 ℃ of scopes, and cumulative deformation is greater than between 60% ~ 70%; Intermediate blank treats that temperature thickness/finished product thickness is 3 ~ 4;

In the finish rolling stage: the start rolling temperature interval is controlled in 880 ~ 950 ℃ of scopes, and the finishing temperature interval is controlled in 780 ~ 850 ℃ of scopes, and control steel billet total deformation rate is between 70% ~ 80%;

(4) steel plate after the finish to gauge carries out the cooling of ACC laminar flow, and the speed of cooling scope control is in 15 ~ 30 ℃/s scope, and final cooling temperature is controlled in 450 ~ 550 ℃ of scopes;

(5) steel plate carries out air cooling and carry out temper to room temperature, and tempering temperature is controlled in 60 ~ 650 ℃ of scopes, and soaking time is 10 ~ 20 minutes+thickness of slab * 1 minute/mm.

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