CN1580309A - Seamless steel pipe alloy steel with moisture and seawater corrosion resistance and steel pipe working process - Google Patents
Seamless steel pipe alloy steel with moisture and seawater corrosion resistance and steel pipe working process Download PDFInfo
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- CN1580309A CN1580309A CN 03132370 CN03132370A CN1580309A CN 1580309 A CN1580309 A CN 1580309A CN 03132370 CN03132370 CN 03132370 CN 03132370 A CN03132370 A CN 03132370A CN 1580309 A CN1580309 A CN 1580309A
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Abstract
This invention is technics about a special kind of alloy steel and its tube machining. The chemical components of the alloy steel are C0.06-0.10, Si0.20-0.50, Mn0.30-0.60, Cr0.80-1.20, Al0.40-0.80, Mo0.25-0.35, S<=0.015, P<=0.025, and Fe is the rest. The technics successfully solve the moist and seawater erode problems which the regular seamless steel used in heat exchanger can't deal with and prolong the equipment life-span, meanwhile it reduces manufacturing cost and saves alloy resources.
Description
Technical field
The present invention relates to a kind of technological method for processing of weldless steel tube.
Background technology
Along with China's economy changes to the marketization, and progressively integrate with international economy, the crude oil production scope constantly enlarges.The offshore production of crude oil has proposed new requirement for the equipment of petrochemical industry, promptly can moisture resistance damp atmosphere and sea-water corrosion.And No. 20 used not corrosion of humidity atmosphere and seawater such as steel of domestic original manufacturing heat exchanger.Use stainless steel resisting corrosion of chlorine ion well, and the manufacturing cost height of equipment.
Summary of the invention
The present invention provides a kind of weldless steel tube steel alloy and steel pipe technological method for processing with anti-gas ion etching by to the adjustment of tube material composition and the improvement of technological method for processing.
The object of the present invention is achieved like this.
1, the weldless steel tube steel alloy of humidity atmosphere and sea-water corrosion, it is characterized in that: the Chemical Composition of this steel is formed (weight %) and is C0.06-0.10, Si0.20-0.50, Mn0.30-0.60, Cr0.80-1.20, Al0.40-0.80, Mo0.25-0.35, S≤0.015, P≤0.025, all the other are Fe.
Steel alloy design of chemical composition of the present invention is according to as follows:
Carbon: the carbon in the anti-seawater low alloy steel should reduce as far as possible, so carbon content is controlled at scope less than 0.10%;
Silicon: silicon is that effectively silicon can also reduce spot corrosion to reducing steel in seawater splash zone corrosion speed.Add fashionablely when silicon and copper, chromium, molybdenum are compound, better effect is then arranged.
Manganese: manganese is effectively to reducing steel in the erosion rate of splash zone, at least, is effective to the top of splash zone.The present invention is controlled at the 0.30%-0.60% scope with manganese content.
Chromium: chromium is to the existing favourable one side of low alloy steel sea water corrosion resistant, disadvantageous one side is also arranged, in order to obtain the low alloy steel of good sea water corrosion resistant when the alloying, add an amount of alloying element, make itself and the compound advantage that just can bring into play chromium of chromium.Therefore its content is controlled in the 0.80%-1.20% scope.
Molybdenum: molybdenum is very effective in the pitting attack speed of splash zone to reducing steel, particularly when with chromium, silicon coexistence.Therefore its content is controlled in the 0.25%-0.35% scope.
Aluminium: the result of study that has shows that aluminium is effective to average corrosion and the pitting penetration that reduces the littoral area, and aluminium is controlled in the 0.40%-0.80% scope during alloying.
Sulphur and phosphorus all are the harmful elements in the steel, so content control is very low.In 99 editions " content regulation " sulphur and phosphorus have been carried out strict requirement, be defined as S≤0.02%, P≤0.03%.
2, the above-mentioned humidity atmosphere and the weldless steel tube technological method for processing of sea-water corrosion comprise perforation, cold-drawn processing, thermal treatment, flaw detection and check warehouse-in operation; Its perforation process comprises blanking and perforation; Its heat treatment step comprises thermal treatment of passage pipe and production tube thermal treatment; It is characterized in that:
(2), described perforation process also comprises following operation
A, bar is added hot piercing; Heating temperature is 1200-1220 ℃; 55 minutes heat-up times; The heating of pipe blank end temperature difference is not more than 20 ℃;
B, hollow billet one end after the perforation is with the warm-rolling head, dog will guarantee that hollow billet medullary ray and hollow billet head medullary ray are consistent, and must not reverse, overlap, torticollis phenomenon;
(2), the processing condition of described heat treatment step are as follows:
Described passage pipe process of thermal treatment condition is: Heating temperature 750-800 ℃; Soaking time 20 minutes; Air cooling;
Described production tube process of thermal treatment condition is: 930-950 ℃ of Heating temperature normalizing; Soaking time 30 minutes; Air cooling; Tempering temperature 690-710 ℃; Soaking time 100 minutes; Air cooling.
Steel alloy of the present invention can be described as the 09CrMoAl steel seamless steel tube, has the beneficial effect of several respects:
1, good comprehensive mechanical property, the Strength Changes after its supply of material attitude and differing temps SR thermal treatment is little, and ballistic work rises to some extent; Cold plasticity is fine, and also more than 35J, nil-ductility temperature is-10 ℃ to the impelling strength of supply of material attitude-40 ℃;
2, the welding property of 09CrMoAl steel is good, and preheating does not all have cold crack and produces more than 250 ℃.Welding joint is through the thermal treatment of the SR of differing temps stress relieving, and the tensile strength of welding joint has decline slightly, and the ballistic work of weld metal and welded heat affecting zone is constant substantially, but the as-welded relatively raising that all has in various degree of impelling strength.As-welded-40 ℃ impelling strength in weld seam center still is higher than the standard code index;
3,09CrMoAl steel and welding joint have good weave construction, and the weld seam center of welding joint is a bainite, and the heat affected zone is a bainite;
4, the sea water resistance stress corrosion performance of 09CrMoAl steel and welding joint is good, its constant load critical exponent σ
Th=0.95 σ
sAnd σ
Th=0.85 σ
sσ apparently higher than the NACE TMO177-1996 of NACE regulation
Th〉=0.45 σ
sRequirement.
5, the technical maturity of the weldless steel tube of 09CrMoAl steel production, stable can satisfy the production service requirements of pressurized vessel.
6, the purposes of the weldless steel tube of 09CrMoAl steel production is an equipment such as interchanger in the offshore oil chemical industry, as the interchanger of the atmospheric and vacuum distillation unit primary tower of the oil refining apparatus interchanger weldless steel tube with weldless steel tube and ordinary decompression column; The interchanger weldless steel tube of catalysis system separation column and absorption stabilizer tower.The form of corrosion that can solve has moist atmosphere, seawater, HCl-HS-HO type.Its corrosion resistant form has following several: H 2 S stress corrosion wets (1); (2) wet hydrogen sulfide uniform corrosion; (3) C1
-Ion stress corrosion etc.
The weldless steel tube that adopts steel alloy of the present invention to manufacture, successful solution the special-purpose weldless steel tube of the interchanger problem of humidity atmosphere and sea-water corrosion not, improved service life of equipment, use this steel alloy steel pipe directly to use seawater as heat transferring medium, draw materials conveniently, and saved Freshwater resources.The weldless steel tube that adopts steel alloy of the present invention to manufacture on the other hand greatly reduces the device fabrication cost, has saved and has produced stainless alloy resource.
Embodiment
Embodiment 1:
The composition of alloy steel seamless steel tube is C0.06, Si0.21, and Mn0.5, Cr0.98, Al0.70, Mo0.30, S≤0.015, P≤0.025, all the other are Fe.
The technological process of this steel pipe comprises perforation, pickling, phosphatization, saponification, cold-drawn processing, thermal treatment, aligning, cutting, flaw detection and check warehouse-in operation; Wherein perforation process comprises blanking and perforation work step; Wherein heat treatment step comprises thermal treatment of passage pipe and production tube thermal treatment.
The work step of wherein boring a hole also comprises following operation:
A, bar is added hot piercing; Heating temperature is 1200 ℃; 55 minutes heat-up times; The heating of pipe blank end temperature difference is not more than 20 ℃;
B, hollow billet one end after the perforation is with the warm-rolling head, is about to tube head and rolls into entity, be convenient to follow-up cold-drawn operation, dog will guarantee that hollow billet medullary ray and hollow billet head medullary ray are consistent, and must not reverse, overlap, torticollis phenomenon;
Wherein the processing condition of heat treatment step are as follows:
Passage pipe process of thermal treatment condition is: 760 ℃ of Heating temperatures; Soaking time 20 minutes; Air cooling; The thermal treatment of passage pipe is the heat treatment step that carries out after the hollow billet cold-drawn;
Production tube process of thermal treatment condition is: 930 ℃ of Heating temperature normalizings; Soaking time 30 minutes; Air cooling; 700 ℃ of tempering temperatures; Soaking time 100 minutes; Air cooling.
Embodiment 2:
The composition of alloy steel seamless steel tube is C0.10, Si0.49, and Mn0.60, Cr1.10, Al0.80, Mo0.35, S≤0.015, P≤0.025, all the other are Fe.
The technological method for processing of its steel pipe is with embodiment 1.
Embodiment 3:
The composition of alloy steel seamless steel tube is C0.07, Si0.45, and Mn0.45, Cr0.90, Al0.65, Mo0.28, S≤0.015, P≤0.025, all the other are Fe.
The technological method for processing of its steel pipe is with embodiment 1.
Embodiment 4:
The composition of alloy steel seamless steel tube is C0.09, Si0.42, and Mn0.46, Cr1.0, Al0.60, Mo0.34, S≤0.015, P≤0.025, all the other are Fe.
The technological method for processing of its steel pipe is with embodiment 1.
Claims (2)
1, the weldless steel tube steel alloy of humidity atmosphere and sea-water corrosion, it is characterized in that: the Chemical Composition of this steel is formed (weight %) and is C0.06-0.10, Si0.20-0.50, Mn0.30-0.60, Cr0.80-1.20, Al0.40-0.80, Mo0.25-0.35, S≤0.015, P≤0.025, all the other are Fe.
2, the weldless steel tube technological method for processing of humidity atmosphere according to claim 1 and sea-water corrosion comprises perforation, cold-drawn processing, thermal treatment, flaw detection and check warehouse-in operation; Its perforation process comprises blanking and perforation; Its heat treatment step comprises thermal treatment of passage pipe and production tube thermal treatment; It is characterized in that:
(1), described perforation process also comprises following operation
A, bar is added hot piercing; Heating temperature is 1200-1220 ℃; 55 minutes heat-up times; The heating of pipe blank end temperature difference is not more than 20 ℃;
B, hollow billet one end after the perforation is with the warm-rolling head, dog will guarantee that hollow billet medullary ray and hollow billet head medullary ray are consistent, and must not reverse, overlap, torticollis phenomenon;
(2), the processing condition of described heat treatment step are as follows:
Described passage pipe process of thermal treatment condition is: Heating temperature 750-800 ℃; Soaking time 20 minutes; Air cooling;
Described production tube process of thermal treatment condition is: 930-950 ℃ of Heating temperature normalizing; Soaking time 30 minutes; Air cooling; Tempering temperature 690-710 ℃; Soaking time 100 minutes; Air cooling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03132370 CN1580309A (en) | 2003-08-15 | 2003-08-15 | Seamless steel pipe alloy steel with moisture and seawater corrosion resistance and steel pipe working process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03132370 CN1580309A (en) | 2003-08-15 | 2003-08-15 | Seamless steel pipe alloy steel with moisture and seawater corrosion resistance and steel pipe working process |
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| Publication Number | Publication Date |
|---|---|
| CN1580309A true CN1580309A (en) | 2005-02-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03132370 Pending CN1580309A (en) | 2003-08-15 | 2003-08-15 | Seamless steel pipe alloy steel with moisture and seawater corrosion resistance and steel pipe working process |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101787485A (en) * | 2010-03-30 | 2010-07-28 | 武汉钢铁(集团)公司 | Sea water corrosion-resistant steel with low cost |
| CN102345999A (en) * | 2011-06-27 | 2012-02-08 | 苏州方暨圆节能科技有限公司 | Stainless steel material for cooling flat pipe of heat exchanger |
| CN103966514A (en) * | 2014-05-28 | 2014-08-06 | 江苏三耐特钢有限公司 | Seawater corrosion resistant tubular product |
| CN109355476A (en) * | 2018-12-05 | 2019-02-19 | 江苏科技大学 | A kind of anti-CO2Low-alloy steel material of corrosion and the preparation method and application thereof |
| CN110039271A (en) * | 2019-04-26 | 2019-07-23 | 张家港保税区亚鑫精密制管有限公司 | High-speed rail resists snakelike damper inner cylinder processing technology |
-
2003
- 2003-08-15 CN CN 03132370 patent/CN1580309A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101787485A (en) * | 2010-03-30 | 2010-07-28 | 武汉钢铁(集团)公司 | Sea water corrosion-resistant steel with low cost |
| CN102345999A (en) * | 2011-06-27 | 2012-02-08 | 苏州方暨圆节能科技有限公司 | Stainless steel material for cooling flat pipe of heat exchanger |
| CN103966514A (en) * | 2014-05-28 | 2014-08-06 | 江苏三耐特钢有限公司 | Seawater corrosion resistant tubular product |
| CN109355476A (en) * | 2018-12-05 | 2019-02-19 | 江苏科技大学 | A kind of anti-CO2Low-alloy steel material of corrosion and the preparation method and application thereof |
| CN110039271A (en) * | 2019-04-26 | 2019-07-23 | 张家港保税区亚鑫精密制管有限公司 | High-speed rail resists snakelike damper inner cylinder processing technology |
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