CN102373370A - Steel for oil gas conveying pipe fittings - Google Patents
Steel for oil gas conveying pipe fittings Download PDFInfo
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- CN102373370A CN102373370A CN201010252574XA CN201010252574A CN102373370A CN 102373370 A CN102373370 A CN 102373370A CN 201010252574X A CN201010252574X A CN 201010252574XA CN 201010252574 A CN201010252574 A CN 201010252574A CN 102373370 A CN102373370 A CN 102373370A
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- steel
- oil gas
- gas conveying
- pipe fittings
- conveying pipe
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Abstract
Relating to steel for oil gas conveying high pressure pipeline fittings, the invention relates to steel for oil gas conveying pipe fittings, and mainly aims to solve the problems of no resistance to low temperature and poor resistance to H2S corrosion of existing steel for high pressure pipe fittings. The steel for oil gas conveying pipe fittings of the invention is 10Mn2VTiNbA steel, which has Fe as the main chemical component as well as other metallic elements that are in the following weight ratio referring to the total weight: 0.08%-0.12% of C, 0.15%-0.37% of Si, 1.35%-1.75% of Mn, less than or equal to 0.01% of S, less than or equal to 0.015% of P, 0.02%-0.07% of V, 0.01%-0.04% of Ti, 0.035%-0.070% of Nb, and less than or equal to 0.25% of CE. The production technology of the steel in the invention is conducted in line with the technical rules for X80 steel production in the API5LPSL2 standard. The steel for oil gas conveying pipe fittings of the invention has the advantages of strong resistance to H2S corrosion and strong low temperature resistance.
Description
Technical field:
The present invention relates to a kind of oil gas carries the pressure piping pipe fitting to use steel.
Background technology:
That existing H.P.F is widely used with steel is APISLPSL
2The intensity of X80 steel and plasticity can satisfy the H.P.F requirement in the standard, but not low temperature resistant, anti-H
2The S corrosive nature is poor, bursting by freezing often occurs or because of the corrosion pipe explosion accident.
Summary of the invention:
Technical problem to be solved by this invention provides a kind of anti-H
2S corrosion and the strong transportation pipe spare of low temperature tolerance ability are used steel.
Above-mentioned purpose is achieved in that described transportation pipe spare is 10Mn with steel
2The VTiNbA steel; Its chemical constitution is main with Fe, and the per-cent that other metallic element accounts for gross weight is: C 0.08%-0.12%, Si0.15%-0.37%, Mn1.35%-1.75%, S≤0.01%, P≤0.015%, V 0.02%-0.07%, Ti 0.01%-0.04%, Nb 0.035%-0.070%, C
E≤0.25%.
CE＝C+Si/30+Mn/20+Gr/20+MO/15+Ni/60+V/10+Cu/20+5B≤0.25％
Described transportation pipe spare is to press 10Mn with the working method of steel
2The chemical ingredients of VTi NbA steel adopts electric furnace+VD stove or converter+VD stove to smelt, and production technique is according to API5LPSL
2The production technology rules of X80 steel are carried out in the standard.
Advantage of the present invention is: 10Mn
2V TiNbA is the perlitic steel that ferritic adds cementite in metallographic structure.C forms cementite with Fe chemical combination in steel, carbon content is high more in the steel, and cementite area occupied in metallographic structure is also big more, and the purity of steel also improves thereupon, but the plasticity of steel and impelling strength also decrease.It is to make that the ferritic area accounts for more than 85% in its metallographic structure that the C purpose falls in the present invention, is beneficial to low-temperature impact toughness and improves.
Si is a kind of good reductor in molten steel, it and O
2Chemical combination forms SiO
2Float over molten steel surface, pull down, play except that O with slag
2Fluxing effect.
Mn is good deoxidation, sweetening agent in molten steel, and it can eliminate or weaken the red brittleness that sulphur causes, improves the hot workability of steel; The sosoloid that Mn and iron form can improve ferritic intensity; It is again a carbide forming element, and it gets in the cementite, replaces the carbide that the part iron atom forms, and plays the effect of refine pearlite group; Make the matrix of steel obtain to strengthen.Mn is again the principal element that reduces the low temperature brittleness transition temperature in the steel, thereby improves the low-temperature impact toughness of steel.
S, P form low melting component in steel, and respectively with crystal boundary on, they belong to harmful element, content is low more good more in the steel.It is minimum in steel, S, P to be dropped to, and this is anti-H
2The effective technology measure of S steel.
V forms particle in steel minimum, and fusing point is high, again carbide-the V of stabilizer pole
4C
3, in the phase transition process of steel, with V
4C
3For the nucleus refinement ferrite crystal grain, and can suppress effectively that crystal boundary moves and grain growth.Thereby can effectively improve the hardening capacity matrix strength and the low-temperature impact toughness of steel.
T i is one of very active metallic element in the chemistry, and it and nitrogen in steel, oxygen, carbon all have extremely strong avidity, and it also is better than iron with the avidity of sulphur.Therefore, it is the effective element of a kind of good reductor and fixed nitrogen, sulphur, under some special conditions, can replace manganese and form titanium sulfide, forms to avoid hot-short iron sulphide.Though titanium is the strong carbide forming element, it does not form double carbide with other element, and it and carbon only form a kind of carbide-T i C.T i C bonding force is very strong, and is extremely stable, be difficult for to decompose, and in steel, only is heated to more than 1000 degree Celsius, the α that could dissolve in sosoloid lentamente mutually with γ mutually in.In phase transition process, be nucleus with T i C, thus refinement ferrite crystal grain, improved the intensity of steel.
The ferro-niobium of steel-making usefulness, actual is the niobium tantalum alloy.They are symbiotic in the mineral deposit, when smelting, are difficult to separate, and ferro-niobium is the coexistence of niobium tantalum.They and carbon, nitrogen, oxygen all have extremely strong avidity, and form accordingly very stable compound with it.Their main effects in steel are the refinement ferrite crystal grains, effectively improve intensity, impelling strength and the creep resisting ability of steel, and can reduce the heat sensitivity and the temper brittleness of steel.
So grade of steel of the present invention is high, carbon content is low, and impelling strength is high, anti-H
2S corrosion and low temperature tolerance ability are strong; Through test, the room temperature tensile performance is all qualified with " V " notched specimen-48 ℃ ballistic work, is more than 6 times of low-temperature steel impact value in the U.S. ASTM A333-92 standard; And fracture is plasticity; Good welding performance has reached the performance level of Ap15L-2000 standard performance and X80 steel, can satisfy the needs that oil gas is carried H.P.F.
Embodiment:
Described transportation pipe spare is 10Mn with steel
2VT i NbA steel, its chemical constitution are main with Fe, and the per-cent that other metallic element accounts for gross weight is: C 0.08% or 0.10% or 0.11% or 0.12%; S i0.15% or 0.20% or 0.26% or 0.31% or 0.35% or 0.37%; Mn 1.35% or 1.39% or 1.42% or 1.51% or 1.54% or 1.63% or 1.75%; S≤0.01%; P≤0.015%; V 0.02% or 0.021% or 0.04% or 0.05% or 0.07%; T i 0.01% or 0.017 or 0.02% or 0.03% or 0.04%; Nb 0.035% or 0.037% or 0.039% or 0.050% or 0.060% or 0.070%; C
E≤0.25%.
CE＝C+S?i/30+Mn/20+Gr/20+MO/15+N?i/60+V/10+Cu/20+5B≤0.25％
Described transportation pipe spare is to press 10Mn with the working method of steel
2The chemical ingredients of VT i NbA steel adopts electric furnace+VD stove or converter+VD stove to smelt, and production technique is according to AP I 5LPSL
2The production technology rules of X80 steel are carried out in the standard.
Claims (1)
1. a transportation pipe spare is used steel, and described transportation pipe spare is 10Mn with steel
2The VTiNbA steel; It is characterized in that: chemical constitution is main with Fe, and the per-cent that other metallic element accounts for gross weight is: C 0.08%-0.12%, S i 0.15%-0.37%, Mn 1.35%-1.75%, S≤0.01%, P≤0.015%, V 0.02%-0.07%, T i 0.01%-0.04%, Nb 0.035%-0.070%, C
E≤0.25%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010252574XA CN102373370A (en) | 2010-08-13 | 2010-08-13 | Steel for oil gas conveying pipe fittings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010252574XA CN102373370A (en) | 2010-08-13 | 2010-08-13 | Steel for oil gas conveying pipe fittings |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102373370A true CN102373370A (en) | 2012-03-14 |
Family
ID=45792594
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010252574XA Pending CN102373370A (en) | 2010-08-13 | 2010-08-13 | Steel for oil gas conveying pipe fittings |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102373370A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105063483A (en) * | 2015-08-27 | 2015-11-18 | 攀钢集团西昌钢钒有限公司 | X65 pipeline steel and production method thereof |
| CN107974615A (en) * | 2017-11-28 | 2018-05-01 | 天津中德应用技术大学 | Thickness is less than the Q460E high strength steel plates and its production method of 12mm |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1351187A (en) * | 2000-10-26 | 2002-05-29 | 中国科学院金属研究所 | Process for preparing high-cleanness, high-strength and high-toughness steel for gas delivering pipeline |
-
2010
- 2010-08-13 CN CN201010252574XA patent/CN102373370A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1351187A (en) * | 2000-10-26 | 2002-05-29 | 中国科学院金属研究所 | Process for preparing high-cleanness, high-strength and high-toughness steel for gas delivering pipeline |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105063483A (en) * | 2015-08-27 | 2015-11-18 | 攀钢集团西昌钢钒有限公司 | X65 pipeline steel and production method thereof |
| CN105063483B (en) * | 2015-08-27 | 2017-08-25 | 攀钢集团西昌钢钒有限公司 | X65 pipe line steels and its production method |
| CN107974615A (en) * | 2017-11-28 | 2018-05-01 | 天津中德应用技术大学 | Thickness is less than the Q460E high strength steel plates and its production method of 12mm |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120314 |