CN104726666A - Production method for super-strength wear-resistant binding strap - Google Patents

Abstract

A production method for a super-strength wear-resistant binding strap comprises the following steps of using 1Cr12WMoV as raw steel; performing cold rolling on the raw steel; performing high-temperature austenitizing on the raw steel after the raw steel is uncoiled, stripped and deburred; performing quenching on the raw steel in NaNO3 aqueous solution; performing NaNO3 salt bath quenching; performing tempering on the steel after the steel is washed by water conventionally; naturally cooling down the steel until the temperature of the steel reaches room temperature; and then coiling the steel. The tensile strength of the binding strap is not lower than 1200 MPa, the elongation is not lower than 8%, and layered brittle failure is avoided, namely the mechanical property is high; and the surface hardness value is not lower than 60 HRC, and the binding strap cannot be changed obviously even if the binding strap is repeatedly ground and wiped 2000 times, namely the wear resistance is high. Owing to the performance of the binding strap, the binding strap can be used for binding and packaging stone articles which are heavy, have complicated geometrical shapes and are high in surface roughness.

Description

The production method of the wear-resisting tie of a kind of superstrength

Technical field

The present invention relates to a kind of production method of tie, belong to the production method of the wear-resisting tie of a kind of superstrength particularly.

Background technology

The wear-resisting tie of superstrength is a kind of cold rolling deep processed product of high added value, is widely used in the bailing of large weight, complex geometry, stone pledge product that surfaceness is high, generally should has excellent mechanical property and wear resisting property.

For the preparation of the stone raw material transport of stone implement, jadeware and pottery with when depositing, because weight is large, complex geometry, surfaceness are high, therefore require that corresponding tie has good mechanical property and wear resisting property, to prevent because strong friction and shock action cause broken belt, cause raw material impaired or cause security incident.

Common in the market turn blue tie or japanning tie, have the bailing of the object of regular geometric shapes and flat surface under being mainly used in normal condition, intensity is generally also all no more than 1000 MPa, cannot tie up above-mentioned stone matter starting material.Under normal circumstances, in industrial production mainly by steel strip surface coating, plating, hot dip, spray the wear resisting property that one or more layers mode with the protective layer of higher hardness improves tie.This way is fairly simple, but also there is obviously shortcoming: one is that process flow is long, and often need to aid in extra coating, plating, hot dip, spraying equipment, production cost is high; Two be due to coating or the physicochemical property between coating and base material inconsistent, through the gouging abrasion of long-time high strength, bonding force is deteriorated, be easy to occur aging, chap, the phenomenon such as come off, and has a strong impact on the work-ing life of tie; Three is that coating or coat-thickness are often comparatively large, generally can reach 50 ~ 100 μm, can often occur cassette tape phenomenon, significantly reduce production efficiency after tie enters automatic packing machine.

With regard to the production technique of superstrength tie self, the general quenching-and-tempering process adopting quenching+tempering, mainly contains four kinds of modes such as lead patenting+tempering, two-phase region quenching+tempering, oil bath quenching+tempering and salt bath quenching+tempering at present.

Lead patenting+tempering process is with the Pb of liquid molten for quenchant, and by forming bainite structure to ensure product performance, industrial scale also can realize.But because Pb is a kind of hypertoxic element, serious environment pollution, this technique is prohibited use by country already.

Two-phase region quenching+tempering technique using water as quenchant, with low cost, less pollution.But because cooling power is comparatively strong, cause larger internal stress, product easily ftractures, and cannot ensure that product has good plate shape.

Oil bath quenching+tempering technique is using oil as quenchant, and cooling power is more weak, and the internal stress caused is less, and thus the possibility of product generation cracking is lower.But, the steel band oil that surface is easily residual a small amount of after quenching, not easy cleaning, can have influence on the surface quality of product; Meanwhile, residual oil also easily burns when tempering, causes fire failure.

Salt bath quenching+tempering process, using the nitrate of melting as quenchant, has good thermal conductivity and more weak cooling power, and by forming martensitic stucture to ensure product performance, its toxicity also will be bathed lower than Pb.But this technique also exists a shortcoming: the nitrate cooling power of melting is more weak, need long time just can be cooled to the corresponding structural transformation of temperature required concurrent life, easily make the less steel of supercooled austenite stability form perlite in process of cooling.In addition, because cooling time is long, produce and often need to carry out at a slow speed, this can cause working efficiency low, and production cost rises.

Publication number is the Chinese patent of CN101363078A, it discloses the production method of a kind of tensile strength >=1250 MPa tie.Raw material steel grade adopts following Composition Design: C:0.29 ~ 0.35%, Mn:1.20 ~ 1.55%, Si:0.15 ~ 0.35%, P :≤0.030%, S :≤0.030%.Producing thickness by lead patenting+tempering process is 0.9 mm, and tensile strength is not less than 1250 MPa, and unit elongation is not less than the superstrength tie of 6%.This technique is with the Pb of liquid molten for quenchant, and by forming bainite structure to ensure product performance, industrial scale also can realize.But because Pb is a kind of hypertoxic element, serious environment pollution, this technique is prohibited use by country already, should not promote.

Publication number is the Chinese patent of CN101805870A, it discloses the production method of a kind of tensile strength >=1100 MPa tie.Raw material steel grade adopts following Composition Design: C:0.25 ~ 0.35%, Mn:1.0 ~ 2.0%, Si :≤0.45%, P :≤0.04%, S :≤0.04%.Going out thickness by two-phase region quenching+tempering explained hereafter is 0.5 ~ 1.2 mm, and tensile strength is not less than 1100 MPa, and unit elongation is not less than the superstrength tie of 10%.This technique using water as quenchant, with low cost, less pollution.But because cooling power is comparatively strong, cause larger internal stress, product easily ftractures, and cannot ensure that product has good plate shape.

Publication number is the Chinese patent of CN103820709A, it discloses the production method of a kind of tensile strength >=1020 MPa tie.Raw material steel grade adopts following Composition Design: C:0.12 ~ 0.22%, Mn:0.50 ~ 1.20%, Si :≤0.010%, P :≤0.015%, S :≤0.015%, V:0.030 ~ 0.060%, Ti:0.020 ~ 0.040%, Als:0.030 ~ 0.060%.Going out thickness by oil bath quenching+tempering explained hereafter is 1.0 mm, and tensile strength is not less than 1020 MPa, and unit elongation is not less than the superstrength tie of 9%.This technique is using oil as quenchant, and cooling power is more weak, and the internal stress caused is less, and thus the possibility of product generation cracking is lower.But, the steel band oil that surface is easily residual a small amount of after quenching, not easy cleaning, can have influence on the surface quality of product; Meanwhile, residual oil also easily burns when tempering, causes fire failure.

Publication number is the Chinese patent of CN104294148A, it discloses the production method of a kind of tensile strength >=1000 MPa zinc coating tie.Raw material steel grade adopts following Composition Design: C:0.05 ~ 0.15%, Mn:0.50 ~ 1.00%, Si :≤0.010%, P :≤0.010%, S :≤0.010%, Nb:0.020 ~ 0.040%, Als:0.045 ~ 0.085%.Producing thickness by salt bath austempering+tempering process is 0.8 mm, and tensile strength is not less than 1000 MPa, and unit elongation is not less than the zinc coating tie of 9%.Product surface generates one deck strong adhesion, thickness is 0.40 ~ 0.60 μm, the glossiness silver gray zinc layers of tool, is placed in room atmosphere environment, obvious corrosion does not occur in 100 days, meet the needs that low and middle-end cold rolled automobile sheet carries out enlacement packaging completely.This technique, using the nitrate of melting as quenchant, has good thermal conductivity and more weak cooling power, and by forming martensitic stucture to ensure product performance, its toxicity also will be bathed lower than Pb.But this technique also exists a shortcoming: the nitrate cooling power of melting is more weak, need long time just can be cooled to the corresponding structural transformation of temperature required concurrent life, easily make the less steel of supercooled austenite stability form perlite in process of cooling.In addition, because cooling time is long, produce and often need to carry out at a slow speed, this can cause working efficiency low, and production cost rises.

Summary of the invention

The present invention is directed to the deficiency that prior art exists, a kind of tensile strength is provided to be not less than 1200 MPa, unit elongation is not less than 8%, without layering brittle failure phenomenon, superficial hardness number is not less than 60 HRC, after the wiping 2000 times of repeatedly polishing, there is not considerable change, large weight can be met, the tie with superstrength and good wear performance and production method that complex geometry, stone pledge product that surfaceness is high carry out the needs of bailing.

Realize the measure of above-mentioned purpose:

A production method for the wear-resisting tie of superstrength, its step:

1) using 1Cr12WMoV as raw material steel grade; Carry out 13 or 14 passage cold rollings, it is 85 ~ 92% that cold rolling total reduction controls;

2) cold rolling feeds is after uncoiling, itemize and deburring, under temperature is 960 ~ 1000 ° of C, carry out influence of high austenizing temp, and it is 5 ~ 12 s that austenitizing time controls;

3) at NaNO ₃quench in the aqueous solution, NaNO in solution ₃weight percent concentration be 10 ~ 15%, its speed of cooling control be 350 ~ 450 ° of C/s, cool time control is 5 ~ 10 s;

4) NaNO is carried out ₃salt bath quenching, it is 30 ~ 60 ° of C/s that its speed of cooling controls, and cool time control is 30 ~ 40 s;

5) after conventional water wash, carry out tempering, it is 500 ~ 560 ° of C that its tempering temperature controls, and it is 50 ~ 80 s that tempering time controls;

6) carry out natural air cooling, be cooled to room temperature;

7) batch.

For existing technique Problems existing, the present invention, by lot of experiments and research, proposes a kind of new thinking.Namely adopt steel alloy 1Cr12WMoV as raw material steel grade, to ensure the wear resisting property of base material.Meanwhile, the mode of interrupted quenching+tempering is adopted to heat-treat: by the steel band after influence of high austenizing temp first at NaNO ₃carry out quench cooled in the aqueous solution, after keeping certain hour, be transferred to the NaNO of melting ₃again quench cooled is carried out in salt bath.Its feature: first at cheap, safe, nontoxic NaNO ₃quench cooled is carried out, due to NaNO in the aqueous solution ₃the cooling power of the aqueous solution is comparatively strong, can make steel band cooling rapidly within the scope of 650 ~ 550 ° of C, save a large amount of production times, improve production efficiency.Then at the NaNO of melting ₃again quench cooled is carried out, due to melting NaNO in salt bath ₃cooling power more weak, can make steel band formed within the scope of 300 ~ 200 ° of C needed for martensitic stucture, ensure that mechanics and the wear resisting property of product.In addition, because quenchant is all only containing NaNO ₃, can not pollute each other, ensure that the purity of quenchant, extend work-ing life.

The present invention is compared with existing common tie, and its tensile strength is not less than 1200 MPa, and unit elongation is not less than 8%, without layering brittle failure phenomenon, i.e. and good mechanical properties; Superficial hardness number is not less than 60 HRC, and after the wiping 2000 times of repeatedly polishing, considerable change does not occur, and namely wear resisting property is good.The needs that product performance meet large weight completely, complex geometry, stone pledge product that surfaceness is high carry out bailing.

Embodiment

Below the present invention is described in detail:

Table 1 is the cold rolling and belt making process parameter of various embodiments of the present invention and comparative example;

Table 2 is mechanical property and the wear resisting property list of various embodiments of the present invention and comparative example.

Various embodiments of the present invention are according to following explained hereafter:

A production method for the wear-resisting tie of superstrength, its step:

1) using 1Cr12WMoV as raw material steel grade; Carry out 13 or 14 passage cold rollings, it is 85 ~ 92% that cold rolling total reduction controls;

2) cold rolling feeds is after uncoiling, itemize and deburring, under temperature is 960 ~ 1000 ° of C, carry out influence of high austenizing temp, and it is 5 ~ 12 s that austenitizing time controls;

3) at NaNO ₃quench in the aqueous solution, NaNO in solution ₃weight percent concentration be 10 ~ 15%, its speed of cooling control be 350 ~ 450 ° of C/s, cool time control is 5 ~ 10 s;

4) NaNO is carried out ₃salt bath quenching, it is 30 ~ 60 ° of C/s that its speed of cooling controls, and cool time control is 30 ~ 40 s;

5) after conventional water wash, carry out tempering, it is 500 ~ 560 ° of C that its tempering temperature controls, and it is 50 ~ 80 s that tempering time controls;

6) carry out natural air cooling, be cooled to room temperature;

7) batch.

Cold rolling and the belt making process parameter of table 1 various embodiments of the present invention and comparative example

The mechanical property of table 2 various embodiments of the present invention and comparative example and wear resisting property

As can be seen from Table 2, the tie of the present patent application, its thickness is 0.8 ~ 1.2 mm; Tensile strength is 1200 ~ 1250 MPa, and unit elongation is 8.0 ~ 9.0%, the good mechanical properties of product; Superficial hardness number is not less than 60 HRC, and after the wiping 2000 times of repeatedly polishing, considerable change does not occur, and wear resisting property is good.The needs that product performance meet large weight completely, complex geometry, stone pledge product that surfaceness is high carry out bailing.

Above-described embodiment is only the best and exemplifies, and is not the restriction to embodiments of the present invention.

Claims (1)

1. a production method for the wear-resisting tie of superstrength, its step:

1) using 1Cr12WMoV as raw material steel grade; Carry out 13 or 14 passage cold rollings, it is 85 ~ 92% that cold rolling total reduction controls;

2) cold rolling feeds is after uncoiling, itemize and deburring, under temperature is 960 ~ 1000 ° of C, carry out influence of high austenizing temp, and it is 5 ~ 12 s that austenitizing time controls;

3) at NaNO ₃quench in the aqueous solution, NaNO in solution ₃weight percent concentration be 10 ~ 15%, its speed of cooling control be 350 ~ 450 ° of C/s, cool time control is 5 ~ 10 s;

4) NaNO is carried out ₃salt bath quenching, it is 30 ~ 60 ° of C/s that its speed of cooling controls, and cool time control is 30 ~ 40 s;

5) after conventional water wash, carry out tempering, it is 500 ~ 560 ° of C that its tempering temperature controls, and it is 50 ~ 80 s that tempering time controls;

6) carry out natural air cooling, be cooled to room temperature;

7) batch.