CN106282511A - A kind of pipe-making method of seamless two-phase stainless-steel pipe - Google Patents
A kind of pipe-making method of seamless two-phase stainless-steel pipe Download PDFInfo
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- CN106282511A CN106282511A CN201510252444.9A CN201510252444A CN106282511A CN 106282511 A CN106282511 A CN 106282511A CN 201510252444 A CN201510252444 A CN 201510252444A CN 106282511 A CN106282511 A CN 106282511A
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Abstract
The invention discloses the pipe-making method of a kind of seamless two-phase stainless-steel pipe, including heating of pipe blank perforation → the most cold rolling → middle product heat treatment → essence just → the most cold rolling → finished product heat treatment → essence just, described middle product heat treatment temperature 1070 DEG C-1090 DEG C, meeting while cold rolling finished product is smoothed out, controlling α phase content is 48-52%；Described finished product heat treatment temperature 1030～1060 DEG C, meet the content requirement of finished product α phase 45-50%, ensure finished product mechanical property requirements simultaneously；In described middle product heat treatment and finished product heat treatment, heat insulating coefficient is 3.0～4.0min/mm wall thickness, temperature retention time=heat insulating coefficient × thickness of steel pipe.The present invention passes through improved process, is possible to prevent finished product α phase content higher, and meets finished product mechanical property requirements.Make two-phase even tissue, it is to avoid mill product difficulty and finished product α phase content are uneven simultaneously.
Description
Technical field
The present invention relates to the manufacture method of metallurgy industry austenite-ferrite type seamless two-phase stainless-steel pipe, refer in particular to two-phase not
Ferrite in rust steel S31803, S32205 (trade mark in standard ASTM A789, ASTM A90) seamless pipe cold working production
Phase (α phase) content controls.
Background technology
Conventional rustless steel is Austenitic rustless steel, for homogeneous structure.Austenite-ferrite type two phase stainless steel is two phase constitutions,
Usually require that control two is compared, it is ensured that the Essential Performance Requirements of two phase stainless steel.But at seamless two-phase stainless-steel pipe foreign standard
Without being distinctly claimed in ASTM A789, ASTM A90, domestic standard GB/T21833 proposes two and compares requirement (α phase
Content should be 40～60%), an esbablished corporation under group of CNPC, it is desirable to S31803 Duplex Phase Stainless Steel production tube
α phase content, 45～50%, to reach optimum corrosion resistance energy, is the most also required to meet the A789 requirement of standard ASTM.
Through data consultation and patent retrieval, control documents and materials and patent without relevant seamless two-phase stainless-steel pipe production tube α phase content
Data (retrieve 5 patent information altogether, from the point of view of clip Text, relate to chemical composition, cold rolling, cold-drawn, heat treatment etc.,
Relevant information is 0).
Baosteel Special Steel Co., Ltd.'s batch production S31803 austenite-ferrite type seamless two-phase stainless-steel pipe, technical process
For: heating of pipe blank perforation → the most cold rolling (middle product) → middle product heat treatment → essence just (aligning, pickling, polishing)
→ the most cold rolling (finished product) → finished product heat treatment → essence just (aligning, pickling, inspection).
Technique brief description:
1) that pipe (solid round steel) is heated to hot piercing is temperature required for heating of pipe blank heating furnace.
2) perforation by roll-type Mannesmann piercing mill, round steel (pipe) is bored a hole, become hollow hollow billet, due to hollow billet outside
Shape, surface quality etc. do not reach production tube technology requirement, need to be to hollow billet cold working (cold rolling).
3) cold rolling at ambient temperature hollow billet is carried out cold rolling by cold pilger mill, reach the surface quality required by production tube,
The requirements such as dimensional accuracy.Owing to cold-rolled biphase steel seamless pipe deforms quantitative limitation, need secondary (or repeatedly) cold under normal circumstances
Roll, can be only achieved required trimmed size.Need before cold rolling to repair watch hollow billet mill the aided processes such as planar defect, flush end mouth, pickling.
4) the cold rolling rear intermediate specification of heat treatment, due to processing hardening, needs to carry out intermediate heat-treatment, could again carry out
Cold rolling.
After cold rolling finished product, steel tube surface quality, dimensional accuracy etc. meet production tube requirement, but physicochemical property can not meet technology and want
Ask, cold rolling rear production tube need to be carried out heat treatment, make finished product physicochemical property meet technology requirement.
5) bending that aligning uses roll leveller heat-treated steel pipe occur is aligned, it is ensured that putting down of fished pipe
Straight degree.
6) pickling heat treatment rear surface produces oxide skin, need to remove with acid washing method.(after brightness heat treatment, do not produce oxidation
Skin, but heat treatment cost is the highest, is used in the product such as nuclear power, space flight, and common product does not uses.)
7) steel tube surface is polished (emery wheel is to metal surface grinding) by polishing by polishing machine, eliminates dual phase steel seamless pipe
The spot defects such as outer surface crackle and pit, load mould, bonding.
Using existing tube-making process and flow process, the seamless two-phase stainless-steel pipe finished product α phase content that different heat treatment technique produces exists
50～60% (part steel pipe finished product same cross section α phase content is uneven, low 50%, high 55%, is also unsatisfactory for technology
Require), α phase fluctuates bigger and higher (see table 1), does not reaches technical requirements of users.
The fluctuation of seamless two-phase stainless-steel pipe finished product α phase content and inhomogeneities major influence factors are chemical composition and heat treatment work
Skill, this steel chemical composition conformance with standard requirement, different heat treatment technique (pertinent literature recommended temperature 1020～1100 DEG C, phase
Closing patent temperature retention time is 4～6min) under the conditions of, production tube α phase content is following (steel pipe represents specification φ 19 × 2mm):
1, using 1080～1100 DEG C of high-temperature heat treatment process after cold rolling middle product, temperature retention time 6 ± 1min, by existing cold rolling
Deformation technique requirement, is cold rolled to QC more smooth, checks after finished product heat treatment, finished product α phase content 55～60%,
It is 60% on a small quantity, is unsatisfactory for technology requirement.
2, using 1020～1040 DEG C of low temperature heat-treatment process after cold rolling middle product, temperature retention time 4 ± 1min, by existing cold rolling
Deformation technique requirement, is cold rolled to QC extremely difficult, and time cold rolling, pipe end cracking and milling train top produce fracture, it is impossible to realize
Regular lot produces.
3, using 1050～1070 DEG C of low temperature heat-treatment process after cold rolling middle product, temperature retention time 4～6min, by existing cold rolling
Deformation technique requirement, rolling difficulty, part pipe end is cracking, finished product α phase content 50～55%, same cross section α phase
Content is uneven, low for 50%, high for 55%, be also unsatisfactory for technology requirement.
Table 1 different heat treatment technique finished product α phase content
| Heat treatment temperature | Temperature retention time | By deformation technique | Finished product α phase content |
| 1080～1100 DEG C | 6±1min | Rolling is smoothly | 55～60%, a small amount of 60% |
| 1050～1070 DEG C | 4～6min | Rolling difficulty | 50～55%, in uneven |
| 1020～1040 DEG C | 4±1min | Rolling and for difficult | / |
Above-mentioned heat treatment, deformation technique show, the finished product produced after high-temperature heat treatment in employing, its α phase content can not meet
Rolling difficulty after technology requirement, and the process of middle warm；Roll extremely difficult after using Low Temperature Heat Treatment, it is impossible to realize regular lot
Produce.
The control method of finished product α phase content, becomes the key problem in technology that seamless two-phase stainless-steel pipe manufactures.
Summary of the invention
Therefore, the technical problem to be solved in the present invention is to provide a kind of two phase stainless steel that can effectively control finished product α phase content
Seamless pipe manufacture method.
The technical scheme is that, the pipe-making method of a kind of seamless two-phase stainless-steel pipe, including heating of pipe blank perforation → the first
Secondary cold rolling → middle product heat treatment → essence just → the most cold rolling → finished product heat treatment → essence just,
Described middle product heat treatment temperature 1070 DEG C-1090 DEG C, meets while cold rolling finished product is smoothed out, controls α phase content
For 48-52%；
Described finished product heat treatment temperature 1030～1060 DEG C, meet the content requirement of finished product α phase 45-50%, ensure finished product simultaneously
Mechanical property requirements；
In described middle product heat treatment and finished product heat treatment, heat insulating coefficient is 3.0～4.0min/mm wall thickness, temperature retention time=
Heat insulating coefficient × thickness of steel pipe.
Middle product Heat Treatment Control α phase scope is 48-52%；Prevent α phase content from increasing by limiting ceiling temperature, increase
Temperature retention time i.e. uses heat insulating coefficient method to ensure α phase content uniformity.Finished product α phase claimed range is 45～50%.
Temperature retention time is applicable to middle product and finished product, and temperature retention time is pressed thickness of steel pipe and calculated, then temperature retention time as identical in thickness of steel pipe
Identical.General finished product wall thickness is less than middle product wall thickness, and the finished product thermal insulation time is less than middle product temperature retention time.Use heat insulating coefficient method
Determining temperature retention time, the steel pipe for different wall is the most reasonable, it is to avoid when not reaching required insulation owing to thickness of steel pipe increases
Between and produce α phase content inhomogeneities.
The pipe-making method of a kind of seamless two-phase stainless-steel pipe according to the present invention, it is preferred that described temperature retention time≤30min.
The biggest specification thick-walled pipe temperature retention time≤30min.
Mechanical property refers to tensile strength Rm, Proof strength of non-proportional Rp0.2 and elongation after fracture, and application claims is double
Phase stainless steel seamless pipe Rm >=620MPa, Rp0.2 >=450MPa, A >=25%.
Compared with original main technique, existing Technology for Heating Processing uses different heat treatment technique, simultaneously by being to middle product and finished product
Number determines different size temperature retention time.For steel pipe different size (wall thickness), heat insulating coefficient is used to determine different temperature retention time more
For rationally, after making heat treatment, tissue is more uniformly distributed, and meets finished product α phase content requirement.
The invention has the beneficial effects as follows:
1, middle product use relatively-high temperature heat treatment, prevent Low Temperature Heat Treatment from can not carry out normal mill product；Finished product uses
Relative low temperature heat treatment, prevents finished product α phase content higher, and meets finished product mechanical property requirements.
2, determine that steel pipe different size (wall thickness) temperature retention time is the most reasonable by heat insulating coefficient, prevent owing to temperature retention time is not enough
Cause two-phase uneven microstructure, make mill product difficulty and finished product α phase content uneven.
Detailed description of the invention
Embodiment 1 (steel pipe represents specification φ 19 × 2mm)
1, heating of pipe blank perforation (φ 65 × 5) → the most cold rolling (φ 38 × 3) → centre product heat treatment (heat-treated under medium temperature,
Be incubated by coefficient) → essence just → the most cold rolling (φ 19*2) → finished product heat treatment (K cryogenic treatment, by coefficient be incubated) → become
Product essence just → warehouse-in.
2, heating of pipe blank perforation (φ 65 × 5) → the most cold rolling (φ 38 × 3), for original common process.
3, middle product heat treatment (heat-treated under medium temperature is incubated by coefficient), for existing new technology, in roller hearth heat-treated furnace at heat
Reason, temperature sets 1080 DEG C, and heat insulating coefficient takes 3.0min/mm, temperature retention time is 9min.
4, finished product essence is just → the most cold rolling (φ 19*2), for original common process.
5, finished product heat treatment (K cryogenic treatment, by coefficient be incubated), for existing new technology, heat treatment in roller hearth heat-treated furnace,
Finished product temperature sets 1030 DEG C, and heat insulating coefficient takes 3.0min/mm, temperature retention time is 6min, produces to finished product, mechanical property
Qualified, α phase content 46%, meet technology and require (see table 2).
6, finished product essence just → warehouse-in, for original common process.
Embodiment 2 (steel pipe represents trimmed size φ 19 × 2mm)
1, heating of pipe blank perforation (φ 65 × 5) → the most cold rolling (φ 38 × 3) → centre product heat treatment (heat-treated under medium temperature,
Be incubated by coefficient) → essence just → the most cold rolling (φ 19*2) → finished product heat treatment (K cryogenic treatment, by coefficient be incubated) → become
Product essence just → warehouse-in.
2, heating of pipe blank perforation (φ 65 × 5) → the most cold rolling (φ 38 × 3), for original common process.
3, middle product heat treatment (heat-treated under medium temperature is incubated by coefficient), for existing new technology, in roller hearth heat-treated furnace at heat
Reason, temperature sets 1080 DEG C, and heat insulating coefficient takes 4.0min/mm, temperature retention time 12min.
4, essence is just → the most cold rolling (φ 19*2), for original common process.
5, finished product heat treatment (K cryogenic treatment, by coefficient be incubated), for existing new technology, heat treatment in roller hearth heat-treated furnace,
Finished product temperature sets 1060 DEG C, and heat insulating coefficient takes 4.0min/mm, temperature retention time is 8min, produces to finished product, mechanical property
Qualified, α phase content 50%, meet technology and require (see table 2).
6, finished product essence just → warehouse-in, for original common process.
Embodiment 3 (steel pipe represents trimmed size 38 × 3mm)
1, heating of pipe blank perforation (φ 76 × 7) → the most cold rolling (φ 57 × 4.5) → centre product heat treatment (Zhong Wenchu
Reason, is incubated by coefficient) → essence just → the most cold rolling (φ 38*3) → finished product heat treatment (K cryogenic treatment, by coefficient be incubated)
→ finished product essence just → warehouse-in.
2, heating of pipe blank perforation (φ 76 × 7) → the most cold rolling (φ 57 × 4.5), for original common process.
3, middle product heat treatment (heat-treated under medium temperature is incubated by coefficient), for existing new technology, in roller hearth heat-treated furnace at heat
Reason, temperature sets 1080 DEG C, and heat insulating coefficient takes 3.5min/mm, temperature retention time 16min.
4, essence is just → the most cold rolling (φ 38*3), for original common process.
5, finished product heat treatment (K cryogenic treatment, by coefficient be incubated), for existing new technology, heat treatment in roller hearth heat-treated furnace,
Finished product temperature sets 1040 DEG C, and heat insulating coefficient takes 3.5min/mm, temperature retention time is 10.5min, produces to finished product, mechanical property
Can be qualified, α phase content 48%, meet technology and require (see table 2).
6, finished product essence just → warehouse-in, for original common process.
Table 2 embodiment and α phase content
Steel pipe heating, perforation, other operation such as cold rolling are steel pipe normal process steps, and implementation process is smooth, and finished surface quality is good,
Impact on environmental protection and secure context does not occurs.
By above-mentioned embodiment, 6, this user's contract of whole year production in 2013 smelts heat (batch) number, 250 tons of finished products, product table
Face quality, finished product mechanical property meet product standard requirement, and finished product α phase content, between 45～50%, meets user's technology
Requirement, has preferable economic benefit and social benefit.
Claims (3)
1. a pipe-making method for seamless two-phase stainless-steel pipe, including heating of pipe blank perforation → the most cold rolling → middle product warm
Process → essence just → the most cold rolling → finished product heat treatment → essence just, it is characterised in that:
Described middle product heat treatment temperature 1070 DEG C-1090 DEG C, meets while cold rolling finished product is smoothed out, controls α phase content
For 48-52%；
Described finished product heat treatment temperature 1030～1060 DEG C, meet the content requirement of finished product α phase 45-50%, ensure finished product simultaneously
Mechanical property requirements；
In described middle product heat treatment and finished product heat treatment, heat insulating coefficient is 3.0～4.0min/mm wall thickness, temperature retention time=
Heat insulating coefficient × thickness of steel pipe.
The pipe-making method of a kind of seamless two-phase stainless-steel pipe the most according to claim 1, it is characterised in that described insulation
Time≤30min.
The pipe-making method of a kind of seamless two-phase stainless-steel pipe the most according to claim 1, it is characterised in that described two-phase
Rm >=the 620MPa of stainless steel seamless pipe, Rp0.2 >=450MPa, A >=25%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510252444.9A CN106282511A (en) | 2015-05-18 | 2015-05-18 | A kind of pipe-making method of seamless two-phase stainless-steel pipe |
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Application publication date: 20170104 |