CA2008853A1 - Method of manufacturing of high-strength seamless steel tubes - Google Patents
Method of manufacturing of high-strength seamless steel tubesInfo
- Publication number
- CA2008853A1 CA2008853A1 CA 2008853 CA2008853A CA2008853A1 CA 2008853 A1 CA2008853 A1 CA 2008853A1 CA 2008853 CA2008853 CA 2008853 CA 2008853 A CA2008853 A CA 2008853A CA 2008853 A1 CA2008853 A1 CA 2008853A1
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- Prior art keywords
- tubes
- thy
- steel
- hot
- rolling
- Prior art date
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Abstract
Abstract of the Disclosure A method of manufacturing high-strength seamless steel tubes by hot-rolling followed b accelerated cooling in which feed ingots of a steel annealed with aluminum and/or silicon of the following composition in weight per cent:
0.08 - 0.13 % C
1.40 - 1.90 % Mn 0.20 - 0.50 % Cr 0 - 0.50 % Mo 0 - 0.70 % Ni 0 - 0.40 % Cu 0.04 - 0.13 % V
max. 0.020 % P
max. 0.010 % S
wherein the balance comprises iron and ordinary impurities, the sum of the contents of Cr and Mo is within the range of about 0.20 to about 0.70% and the Cu/Ni quantity ration in case of the presence of both elements is limited to at most 1, are heated to a temperature of about 1150 to about 1280°C and hot-rolled into tubes in multiple stages and, after leaving the last hot-rolling stage, the tubes which have a temperature above AC3 are quenched directly from the rolling heating in about 5 to about 50 seconds, substantially avoiding formation of ferrite, down to a temperature range of about 340-560°C and thereafter the tubes are further cooled in air.
0.08 - 0.13 % C
1.40 - 1.90 % Mn 0.20 - 0.50 % Cr 0 - 0.50 % Mo 0 - 0.70 % Ni 0 - 0.40 % Cu 0.04 - 0.13 % V
max. 0.020 % P
max. 0.010 % S
wherein the balance comprises iron and ordinary impurities, the sum of the contents of Cr and Mo is within the range of about 0.20 to about 0.70% and the Cu/Ni quantity ration in case of the presence of both elements is limited to at most 1, are heated to a temperature of about 1150 to about 1280°C and hot-rolled into tubes in multiple stages and, after leaving the last hot-rolling stage, the tubes which have a temperature above AC3 are quenched directly from the rolling heating in about 5 to about 50 seconds, substantially avoiding formation of ferrite, down to a temperature range of about 340-560°C and thereafter the tubes are further cooled in air.
Description
2~
I ' 93 31~17 121 al 2: 1 212 972 5~7 C;IHEN PONTRNI 03 lid th~Inv~ntion Thy ~rJot3nt inv~ntl~n fit to a ~0thod ox suf P,~uring hlgh ~trQngth let steel t~4~$ by jot oiling ~ollo wed by accs~ler~ cao~ E rrO~ tha rolllng h¢~t. Thy tubosl art ~ultllblo or Ulil6 a oil ld nnd ~orlduit pip and compl y at l~aot lo A~I-gr~de X70.
or 93 5 3 '~9 eB~I~ 12~ 02 2; 1 2 12 972 5~1137 C[)HEH PC~R~JI ~4 EI~Q~t~U7~ .~ the ~Qa eaml~3s~ tubo~ are ~uotor~rlly m~m~actur~d i:~y thy hot rollin ox otoel ingot whlch have bran heo'c~d 'co abeut 1200-1250'C . Tho maln sh~plng oLr thy rolllng proce~i tax place ~UE~t below the lngot dr~wlng 'compnraturo and th~r~or~ it Vory hl~7h t~npor ~tur~, The rParylttalll2~tlon Or the ~tructUr4 cAua~d my thy 8h lping l r bct cull ox th~3e high tump~ratur~o~ to ~tronq grlin ;rowth an, ~;aaordlngly, to corr~pon~llng impAirz~nt ox tho to llghnoa~ ox th0 mat~-rlal. There~4rs~, up to now lt ha a1WAY~ beon con~lde~ed nec:2~ary to rollow tho rolllng proce~ by sop~ate ht3at treatmc:nt ln tho fo~3 Or lo norm ation or age-h&rdhn~ng process tht3rt~y abtalnl~q a miner ~truc~ur~ and lmprov Lng the toughno~ proportlos by re-grnnulation.
8uch a heat tre~ltment roq~roa a c~n~idorablc expenrg Itur~ ox timo and monny 80 thnt it npp~arsd deslrablo to avc,ld this additional tro~tmnnt. It prlnc~ple, lt 16 po~ibl~ by a targ Ted cooling alter tha hot rollin9~ lo produae a br~initic ~truct pro ln tho tubc and, thare~ore~ to sub~otantially avold botl ~errit ~ormatlon end m~rtanslte ~ormatlon. A bainitic etruct lro, in nddltion to providing hirJh strangth value, exhlbi to good toughnees properti00. Thls ~tho~ has, hoover 6c:~rc~ y ban po~l~lbla up to now on a lnrgt lnciu6tri~1 scalt3 since k ~on~xol Or thy t~mpornturo during thy ~cc~lr3r~t*d abolin J :~t~p could nct bo oe~t3ctod ln such A mannor JIB 1::o 2~ urea the ye lahing ox to oainitc roglon.
' 9a ~1~17 12-0~ 212 972 54137 COHEH F'O~:rFlNI
hi lo duo to the raot that tha lndlvldu~ oel tube lnv~rlab ly havo t-mp~raturns whloh not only er prom eAch other it thy ond Or thy last rclllng step jut lo show conoldor ablu ~l~r-rens-o ln importune o'er the l-ngth ox the tubo and ~v-n over th- circumr-r-nc~ by k tub. Th~oe dl~feren ~oc in t-mp-rature amount typlc~lly to up to about lOO'C
and aan Do m~nsur~d at thy ~n4 thy acc-lorated aoollng asp in ~pproxim ~tely unchnng-d amount. TherefOro, in Actual practlce, a flxed co in temperat~ro cannot be achl~ved.
Thls, however, meat that, duo to tho coollng, bol~lt- ~eglon i4 obtalned ln the d~lrod mann-r only in indlvldu Al zonks ox the tubo, whlls in the other zonoa ~errlte it proved by exoo~lvoly olow or ln~u~lclontly doep coollng) or 01Be mar tenslte due to oxco~olv~ly deop coollng). Aa whole, such tub it havo toughnuas end strength propertl-n whl~h dl~er greatly Erom oach othor folly and thoy f thu4 not oultable or thy lnt-nd-d u--.
From Foder~l R~publia or Germany 33 11 62g C2 method it known , however, whlch permit the ~anuracturo ox hl~h-~trength 8~amle~ oll-rlol4 tubo~ Or good toughness proporti~Y rrOm led ha v~ng the ~ollow~ng compo~ltion:
0.02 - 0.12 % C
1.30 - 2.20 Mn mAx. 0.30 Mo max. 0.50 % Ni 0.01 -- O.D4 % Tl 0.02 - 0.06 % Nb 0.003 - 0.008 N
0.03 - 0.05 Al o 001 - 0.003 B
0 001 - O.010 i g _3_ ~3~C~
pa 01~17 l 1 212 972 5~67 I:OHEN F'ONTCINI ~6 the bhlan~ :e kelng lron and ordlnsry lmpuritl0~.
In order to obtain a ~inoly gr~n~lar ~tru~tur~, thy prlor nrt method provide or ~ontrolls~ ~lnnl r~llln~ it low t~mper~tu~ rid (700-850-C), wh~ro~y n ~o~ t-ly unlfor~ ~tartln~
t~mp~ratu ^~ 18 curd by previoualy old equalizing ~nn~llng ~vor who length ot thy tu~o nit it ho been pr~rollod ln thy ho ., Actor the final rolllng, ths tub ool~d wlth watnr and/or al r to room tomper~ture end ~Lnally A~Co te~er~d in ordqr to im~rov the strength prop~rtlo~. The lnter~dl~t~ or ~ube~qu~n : heDt treatment mans An ad~l~ional ~xponoo with r~p~ot t tuchnLo~l plant md unorgy con~umptlon~
, f ?, ' ~3 ~1~17 121 ~4 ;~ 212 972 5~7 CI~HEN PONT;I~`II q7 gu~m~Y 0~ thy InvQ~.$~n An ob~oct Oe th in~entlon l ther~or~, to pro~id~ a mathod ox ma~ur~cturlng ~eaml~ t¢el tube huvlng high yl~l~
point nd high t~llo ~tr~ngthD ~lth~ at thy Ba~O tlma, Good ~oughn By prop2~ti~ tAV+20~c~ 6QJ) g~ude X70 or hlgh~r) wlthou havlng to ~ub~ oct tho tub~u to an a~dition~l heat troatm nt after ~ollln~. Accordlng to thl~ method, tomp0~tu~e dl~f~r ~oe~ ln the rollud lube dirdctly borore thy ooollng of the tu ox butwe~n Qbout 100-15~ K nr~ pc~ml~lblo wlthout ~ao~cr living thy dealred propurti~a. who tub can lo ye produo at low p~lce and thoreror- do not reguiro l~rg~
qyanti iQa 0~ ~xpun~lve alloy elements, Thla oh~ect l ~chlevu~ by method ox m~nu~oturln~
hlgh 8 rongth ~o~tnless staal tu~e~ by hot rolllng ~ollow~d by ado atcd tooling, whlch oo~pri60~ (a provi~lng rod ingots Or a stow annealn~ with alumlnu~ and/or ~lllcon h~vlng the hollow no ~o~posltlon in wcight per cent o.o~ - 0.13 C
1.40 - 1.90 % Mn D.20 - D.5D Cr o - 0.5D Mo o - 0,70 Ni 0 - 0.40 0,04 - 0.13 V
mix. ~.020 P
max. O.Olo % S
tho ba ance bolng iron and or~in~ry impuri~ie~, the sum ox tha conton 8 of or and Mo lying withltl thy r~ng~ of tout 0.20 to bout .70~ and the Out quant~y ratio ln a ox thæ prn~enoa ~5-2~ so Of both elements being limited to at most l; (b) heating said feed ingots to a temperature of about 1150 to about 1280C and hot-rolling said ingots into tubes in multiple stages; and tc) after leaving the last hot-rolling stage, quenching said tubes having a temperature above AC3 directly from the rolling heat in about 5 to about 50 seconds preferably substantially avoiding formation of ferrite down to a temperature range of about 340-560C and thereafter further cooling said tubes in air. By "substantially" avoiding formation of ferrite is meant that the formation of ferrite does not exceed about lo by weight. The steel composition of the present invention does not contain more than about 0.04~ by weight of Nb and Ti .
In preferred embodiments: at most about 0.04~ by weight of Nb is added to said steel; at most about 0.04% by weight of Ti is added to said steel; the ferrite formation does not exceed 10~ by weight.
35~
'90 01~17 12~ Do 1 212 972 5~a7 OOHIIN l'ONT~NI _~_ .
F~ a graph lllu~tr~ting the benerlel~l Prop rt~e3 ~a~leved ~lth thy ~thod ox thy prevent lnventlon, thy bet OVA indicting ~tr~ngth v~l~oo in N~Z and tb- ordln~te lndlc ~tlng tonolle ~tr-ngth (R~) end ylold palnt Rto.5s Fig. 2 lo graph lllu~t~tl"g ~urthelr b-n-P~
promo: rtl~s echlQvod wlth the method Or thy pre-ent lnven~lon, the l 1-4 ln~lantlng n~toh~d so lmp~ct work ao-c ln ~AV+3O~C) end to lo o~rdlnnt- lndlcotlng tha catoh te~p~r~ture ln c.
Æ~0~35-~
pa 7 121û6 Z~ 1 212 97~ 54137 CO~IEN ~OI~TR~II l0 Thy glutton in ~ccordanco with thy inventlons con~lst~
scent ally or A dl~tinot ~eleotion ox a ot- d mat-rl~l with narrow llmlts or the ~ndlvldual alloy ento and pre-det~rm ned dlmon~ionin~ rules or thy contcnt Or indivldu~l ~l~m~ 4 wlth ro~p-ct to earh oth-r, a well ox co"trolled quench ng traat~nt which it ape~i~io~lly adapted to thls ~At-rl l. it his, aeoordingly, teen po~lble to ~lnd a steel whlch knot on1y ha pro4uccd at low cot ~inae lt ~o~ not r-qulr 1argo amount ox oxp~naiv~ alloy la~ant~, but whloh a1eD rprlalngly cure the torm~tlon Or b~l~lte over n wide tom~er tura range for ln~tAnse, 105 K) or the ooolln~ (chtsh tq~pcr~ ture). who productlon ox ~orrlt- awn 4a~ily bs tilted to noncrl~ loal value Or leoo thin ~40ut lo per wright 4~ the ~trUctu re. It haa beon tound that tho ratio ox the 012mentn copper and nickel to etch other aY well aa thy v sr thy oontent (weight Der cant) ox Cr an Mo are ot extremo imp~rtancq rOr k COOling ~havlor wlth ref~renoa to tho obtaining ox unlrorm atrength ~n~ toughn~s valve This alto true ot thy norrowl r llmlt-d eontont ox earbon, Unto othorwlsa indicted all par and p~raent~gee oro by welght. Whon the ~rodnter~ined compocl loh i- m~int4in~, a steal ia obt~lned which ~xhibltR
prAetlo lly equnlly good valuae wlth respect to thc hat tempera or- ox the quenching treat~nt wlthin a brood temp~r~turQ
r~nga. In thle aonnactlon lt io i~m~terial undar what conditionn 2~ s~3 ' ~0 01~ I 7 12 Do 2 12 ~72 3~ ~7 ~:OHIill lot the told lngotl- f cent or ~x~mpl~, CAlilt ingot round co" lnuou~ catting ruundbd l-qu~r cont$nuou~ a n~J4, folio rou steel).
ho otl1r~no-~ Or thy ~ç~thod Or 'cho pi nt lnve tlon la ~urthor demonstr~tod by th- ~/elu0- of thy tenslll~
it . a g~h R", and the ye ld polnt Rt~, 5 or notchod bay lmp~ct work Av~ O ag a ~unctl~n Or the catoh temp~ra~u~l ox ohs ~ocol~ratud cool ng shown, rOr exempt ln ~lq-. 1 and I. Thy value wound rnre to a ~t~nl havlng the ~ollowln~ co~pooltiont o.os c 1. 5 Mn 0.2~ " Cr 0.06 % V
0.04 Nb o. 016 0. 003 t g thy b lancs ~olng lron J.nd ordinary ixpuritla~.
can by note rro~ Flg. 1, the m-~urod ~olue~ Or t]
yl-ld polnt and ox th- ten-lle ~t~ngth ar- a~proxlm~tely at a con~t nt lov-l with a catch torlperature rango Or 350-520~. Thc yield polnt ratio Xto,~/R~ ore, ln all Cab4U, than B0~.
pit the aoarY0 initial ~tr~ct~re, the Eteel whl~h ha beon oubjo od to the ooollng treatment ox tho pr~sont lnvontlon haJ
good n tch~d bnr lmpact worX values jig. 2). It the r~ng3 ox thy ca ch temporature no 350-520~c, lt it ln all ace olearly r- t nn 50 J qt a tout t-mperaturO of +20-c.
ho method ox thy pre~o~t ln~ention render po~sl~le, wlth t us ox low-c~et alloy and desplto thy dl~penslng with a coil y end ~epA~atn heft trontm~n~, to m~nuSacture hlg~-_9_ Z~ S~3 ' 93 of 7 !21 1~7 æ 1 2 2 972 5~ OHE11 f'ONTRNI 12 utren~ h lest tub-- such as oil-Xl~ld end ~ondult pip my thy aC~8le at coolln~ no who rolling heat, b41nlto ~tructur~
h~vlng good toug~ne~e propertle~ ovor toe entlre lahgth ox thy tub i do~lnltely produced, oven on tubee whlch exhlbit n non-unlro~ t~m~er~ture dlstrlbutlon Dlr~eronce~ l tha nigh topper turn Or us to nbout lOS and, depending on tho co~pO~ tlon ox th- alloy, ~bbvo thl~ te~parature, do not hav- n orltlc 1 er~6ct on th- Ltrength or toughn~c proportie~ oP the tubea o produc-d Wh 11- thorn hns been do~arl~od ~n~ lllustrated n preforred ~mbodl~ nt ox the prevent inv-ntlon, lt l apparent that nu~rou~
~lternt on, oml6alon~ and addltlon- Jay bo m~¢ without dopartl g m the splrlt end scope ox the lnv~ntion tenor t should nl o be ~nd-r~tood that the pr-r~rr~d ombo41~ nt nn4 exarple d~acribed boo art rOr llluotrntlvo purpo~ only a"d ~rs not to by con~truad nD llmltlng th- COP
Or thy nv~ntlon which 1J properly delin~n~od only in the nppende cl~lrs
I ' 93 31~17 121 al 2: 1 212 972 5~7 C;IHEN PONTRNI 03 lid th~Inv~ntion Thy ~rJot3nt inv~ntl~n fit to a ~0thod ox suf P,~uring hlgh ~trQngth let steel t~4~$ by jot oiling ~ollo wed by accs~ler~ cao~ E rrO~ tha rolllng h¢~t. Thy tubosl art ~ultllblo or Ulil6 a oil ld nnd ~orlduit pip and compl y at l~aot lo A~I-gr~de X70.
or 93 5 3 '~9 eB~I~ 12~ 02 2; 1 2 12 972 5~1137 C[)HEH PC~R~JI ~4 EI~Q~t~U7~ .~ the ~Qa eaml~3s~ tubo~ are ~uotor~rlly m~m~actur~d i:~y thy hot rollin ox otoel ingot whlch have bran heo'c~d 'co abeut 1200-1250'C . Tho maln sh~plng oLr thy rolllng proce~i tax place ~UE~t below the lngot dr~wlng 'compnraturo and th~r~or~ it Vory hl~7h t~npor ~tur~, The rParylttalll2~tlon Or the ~tructUr4 cAua~d my thy 8h lping l r bct cull ox th~3e high tump~ratur~o~ to ~tronq grlin ;rowth an, ~;aaordlngly, to corr~pon~llng impAirz~nt ox tho to llghnoa~ ox th0 mat~-rlal. There~4rs~, up to now lt ha a1WAY~ beon con~lde~ed nec:2~ary to rollow tho rolllng proce~ by sop~ate ht3at treatmc:nt ln tho fo~3 Or lo norm ation or age-h&rdhn~ng process tht3rt~y abtalnl~q a miner ~truc~ur~ and lmprov Lng the toughno~ proportlos by re-grnnulation.
8uch a heat tre~ltment roq~roa a c~n~idorablc expenrg Itur~ ox timo and monny 80 thnt it npp~arsd deslrablo to avc,ld this additional tro~tmnnt. It prlnc~ple, lt 16 po~ibl~ by a targ Ted cooling alter tha hot rollin9~ lo produae a br~initic ~truct pro ln tho tubc and, thare~ore~ to sub~otantially avold botl ~errit ~ormatlon end m~rtanslte ~ormatlon. A bainitic etruct lro, in nddltion to providing hirJh strangth value, exhlbi to good toughnees properti00. Thls ~tho~ has, hoover 6c:~rc~ y ban po~l~lbla up to now on a lnrgt lnciu6tri~1 scalt3 since k ~on~xol Or thy t~mpornturo during thy ~cc~lr3r~t*d abolin J :~t~p could nct bo oe~t3ctod ln such A mannor JIB 1::o 2~ urea the ye lahing ox to oainitc roglon.
' 9a ~1~17 12-0~ 212 972 54137 COHEH F'O~:rFlNI
hi lo duo to the raot that tha lndlvldu~ oel tube lnv~rlab ly havo t-mp~raturns whloh not only er prom eAch other it thy ond Or thy last rclllng step jut lo show conoldor ablu ~l~r-rens-o ln importune o'er the l-ngth ox the tubo and ~v-n over th- circumr-r-nc~ by k tub. Th~oe dl~feren ~oc in t-mp-rature amount typlc~lly to up to about lOO'C
and aan Do m~nsur~d at thy ~n4 thy acc-lorated aoollng asp in ~pproxim ~tely unchnng-d amount. TherefOro, in Actual practlce, a flxed co in temperat~ro cannot be achl~ved.
Thls, however, meat that, duo to tho coollng, bol~lt- ~eglon i4 obtalned ln the d~lrod mann-r only in indlvldu Al zonks ox the tubo, whlls in the other zonoa ~errlte it proved by exoo~lvoly olow or ln~u~lclontly doep coollng) or 01Be mar tenslte due to oxco~olv~ly deop coollng). Aa whole, such tub it havo toughnuas end strength propertl-n whl~h dl~er greatly Erom oach othor folly and thoy f thu4 not oultable or thy lnt-nd-d u--.
From Foder~l R~publia or Germany 33 11 62g C2 method it known , however, whlch permit the ~anuracturo ox hl~h-~trength 8~amle~ oll-rlol4 tubo~ Or good toughness proporti~Y rrOm led ha v~ng the ~ollow~ng compo~ltion:
0.02 - 0.12 % C
1.30 - 2.20 Mn mAx. 0.30 Mo max. 0.50 % Ni 0.01 -- O.D4 % Tl 0.02 - 0.06 % Nb 0.003 - 0.008 N
0.03 - 0.05 Al o 001 - 0.003 B
0 001 - O.010 i g _3_ ~3~C~
pa 01~17 l 1 212 972 5~67 I:OHEN F'ONTCINI ~6 the bhlan~ :e kelng lron and ordlnsry lmpuritl0~.
In order to obtain a ~inoly gr~n~lar ~tru~tur~, thy prlor nrt method provide or ~ontrolls~ ~lnnl r~llln~ it low t~mper~tu~ rid (700-850-C), wh~ro~y n ~o~ t-ly unlfor~ ~tartln~
t~mp~ratu ^~ 18 curd by previoualy old equalizing ~nn~llng ~vor who length ot thy tu~o nit it ho been pr~rollod ln thy ho ., Actor the final rolllng, ths tub ool~d wlth watnr and/or al r to room tomper~ture end ~Lnally A~Co te~er~d in ordqr to im~rov the strength prop~rtlo~. The lnter~dl~t~ or ~ube~qu~n : heDt treatment mans An ad~l~ional ~xponoo with r~p~ot t tuchnLo~l plant md unorgy con~umptlon~
, f ?, ' ~3 ~1~17 121 ~4 ;~ 212 972 5~7 CI~HEN PONT;I~`II q7 gu~m~Y 0~ thy InvQ~.$~n An ob~oct Oe th in~entlon l ther~or~, to pro~id~ a mathod ox ma~ur~cturlng ~eaml~ t¢el tube huvlng high yl~l~
point nd high t~llo ~tr~ngthD ~lth~ at thy Ba~O tlma, Good ~oughn By prop2~ti~ tAV+20~c~ 6QJ) g~ude X70 or hlgh~r) wlthou havlng to ~ub~ oct tho tub~u to an a~dition~l heat troatm nt after ~ollln~. Accordlng to thl~ method, tomp0~tu~e dl~f~r ~oe~ ln the rollud lube dirdctly borore thy ooollng of the tu ox butwe~n Qbout 100-15~ K nr~ pc~ml~lblo wlthout ~ao~cr living thy dealred propurti~a. who tub can lo ye produo at low p~lce and thoreror- do not reguiro l~rg~
qyanti iQa 0~ ~xpun~lve alloy elements, Thla oh~ect l ~chlevu~ by method ox m~nu~oturln~
hlgh 8 rongth ~o~tnless staal tu~e~ by hot rolllng ~ollow~d by ado atcd tooling, whlch oo~pri60~ (a provi~lng rod ingots Or a stow annealn~ with alumlnu~ and/or ~lllcon h~vlng the hollow no ~o~posltlon in wcight per cent o.o~ - 0.13 C
1.40 - 1.90 % Mn D.20 - D.5D Cr o - 0.5D Mo o - 0,70 Ni 0 - 0.40 0,04 - 0.13 V
mix. ~.020 P
max. O.Olo % S
tho ba ance bolng iron and or~in~ry impuri~ie~, the sum ox tha conton 8 of or and Mo lying withltl thy r~ng~ of tout 0.20 to bout .70~ and the Out quant~y ratio ln a ox thæ prn~enoa ~5-2~ so Of both elements being limited to at most l; (b) heating said feed ingots to a temperature of about 1150 to about 1280C and hot-rolling said ingots into tubes in multiple stages; and tc) after leaving the last hot-rolling stage, quenching said tubes having a temperature above AC3 directly from the rolling heat in about 5 to about 50 seconds preferably substantially avoiding formation of ferrite down to a temperature range of about 340-560C and thereafter further cooling said tubes in air. By "substantially" avoiding formation of ferrite is meant that the formation of ferrite does not exceed about lo by weight. The steel composition of the present invention does not contain more than about 0.04~ by weight of Nb and Ti .
In preferred embodiments: at most about 0.04~ by weight of Nb is added to said steel; at most about 0.04% by weight of Ti is added to said steel; the ferrite formation does not exceed 10~ by weight.
35~
'90 01~17 12~ Do 1 212 972 5~a7 OOHIIN l'ONT~NI _~_ .
F~ a graph lllu~tr~ting the benerlel~l Prop rt~e3 ~a~leved ~lth thy ~thod ox thy prevent lnventlon, thy bet OVA indicting ~tr~ngth v~l~oo in N~Z and tb- ordln~te lndlc ~tlng tonolle ~tr-ngth (R~) end ylold palnt Rto.5s Fig. 2 lo graph lllu~t~tl"g ~urthelr b-n-P~
promo: rtl~s echlQvod wlth the method Or thy pre-ent lnven~lon, the l 1-4 ln~lantlng n~toh~d so lmp~ct work ao-c ln ~AV+3O~C) end to lo o~rdlnnt- lndlcotlng tha catoh te~p~r~ture ln c.
Æ~0~35-~
pa 7 121û6 Z~ 1 212 97~ 54137 CO~IEN ~OI~TR~II l0 Thy glutton in ~ccordanco with thy inventlons con~lst~
scent ally or A dl~tinot ~eleotion ox a ot- d mat-rl~l with narrow llmlts or the ~ndlvldual alloy ento and pre-det~rm ned dlmon~ionin~ rules or thy contcnt Or indivldu~l ~l~m~ 4 wlth ro~p-ct to earh oth-r, a well ox co"trolled quench ng traat~nt which it ape~i~io~lly adapted to thls ~At-rl l. it his, aeoordingly, teen po~lble to ~lnd a steel whlch knot on1y ha pro4uccd at low cot ~inae lt ~o~ not r-qulr 1argo amount ox oxp~naiv~ alloy la~ant~, but whloh a1eD rprlalngly cure the torm~tlon Or b~l~lte over n wide tom~er tura range for ln~tAnse, 105 K) or the ooolln~ (chtsh tq~pcr~ ture). who productlon ox ~orrlt- awn 4a~ily bs tilted to noncrl~ loal value Or leoo thin ~40ut lo per wright 4~ the ~trUctu re. It haa beon tound that tho ratio ox the 012mentn copper and nickel to etch other aY well aa thy v sr thy oontent (weight Der cant) ox Cr an Mo are ot extremo imp~rtancq rOr k COOling ~havlor wlth ref~renoa to tho obtaining ox unlrorm atrength ~n~ toughn~s valve This alto true ot thy norrowl r llmlt-d eontont ox earbon, Unto othorwlsa indicted all par and p~raent~gee oro by welght. Whon the ~rodnter~ined compocl loh i- m~int4in~, a steal ia obt~lned which ~xhibltR
prAetlo lly equnlly good valuae wlth respect to thc hat tempera or- ox the quenching treat~nt wlthin a brood temp~r~turQ
r~nga. In thle aonnactlon lt io i~m~terial undar what conditionn 2~ s~3 ' ~0 01~ I 7 12 Do 2 12 ~72 3~ ~7 ~:OHIill lot the told lngotl- f cent or ~x~mpl~, CAlilt ingot round co" lnuou~ catting ruundbd l-qu~r cont$nuou~ a n~J4, folio rou steel).
ho otl1r~no-~ Or thy ~ç~thod Or 'cho pi nt lnve tlon la ~urthor demonstr~tod by th- ~/elu0- of thy tenslll~
it . a g~h R", and the ye ld polnt Rt~, 5 or notchod bay lmp~ct work Av~ O ag a ~unctl~n Or the catoh temp~ra~u~l ox ohs ~ocol~ratud cool ng shown, rOr exempt ln ~lq-. 1 and I. Thy value wound rnre to a ~t~nl havlng the ~ollowln~ co~pooltiont o.os c 1. 5 Mn 0.2~ " Cr 0.06 % V
0.04 Nb o. 016 0. 003 t g thy b lancs ~olng lron J.nd ordinary ixpuritla~.
can by note rro~ Flg. 1, the m-~urod ~olue~ Or t]
yl-ld polnt and ox th- ten-lle ~t~ngth ar- a~proxlm~tely at a con~t nt lov-l with a catch torlperature rango Or 350-520~. Thc yield polnt ratio Xto,~/R~ ore, ln all Cab4U, than B0~.
pit the aoarY0 initial ~tr~ct~re, the Eteel whl~h ha beon oubjo od to the ooollng treatment ox tho pr~sont lnvontlon haJ
good n tch~d bnr lmpact worX values jig. 2). It the r~ng3 ox thy ca ch temporature no 350-520~c, lt it ln all ace olearly r- t nn 50 J qt a tout t-mperaturO of +20-c.
ho method ox thy pre~o~t ln~ention render po~sl~le, wlth t us ox low-c~et alloy and desplto thy dl~penslng with a coil y end ~epA~atn heft trontm~n~, to m~nuSacture hlg~-_9_ Z~ S~3 ' 93 of 7 !21 1~7 æ 1 2 2 972 5~ OHE11 f'ONTRNI 12 utren~ h lest tub-- such as oil-Xl~ld end ~ondult pip my thy aC~8le at coolln~ no who rolling heat, b41nlto ~tructur~
h~vlng good toug~ne~e propertle~ ovor toe entlre lahgth ox thy tub i do~lnltely produced, oven on tubee whlch exhlbit n non-unlro~ t~m~er~ture dlstrlbutlon Dlr~eronce~ l tha nigh topper turn Or us to nbout lOS and, depending on tho co~pO~ tlon ox th- alloy, ~bbvo thl~ te~parature, do not hav- n orltlc 1 er~6ct on th- Ltrength or toughn~c proportie~ oP the tubea o produc-d Wh 11- thorn hns been do~arl~od ~n~ lllustrated n preforred ~mbodl~ nt ox the prevent inv-ntlon, lt l apparent that nu~rou~
~lternt on, oml6alon~ and addltlon- Jay bo m~¢ without dopartl g m the splrlt end scope ox the lnv~ntion tenor t should nl o be ~nd-r~tood that the pr-r~rr~d ombo41~ nt nn4 exarple d~acribed boo art rOr llluotrntlvo purpo~ only a"d ~rs not to by con~truad nD llmltlng th- COP
Or thy nv~ntlon which 1J properly delin~n~od only in the nppende cl~lrs
Claims (5)
1. A method of manufacturing high-strength seamless steel tubes by hot rolling followed by accelerated cooling, comprising the following steps:
a) providing feed ingots of a steel annealed with aluminum and/or silicon, having the following composition in weight per cent:
0.08 - 0.13 % C
1.40 - 1.90 % Mn 0.20 - 0.50 % Cr 0 - 0.50 % Mo 0 - 0.70 % Ni 0 - 0.40 % Cu 0.04 - 0.13 % V
max. 0.020 % P
max. 0.010 % S
the balance being iron and impurities, the sum of the contents of Cr and Mo lying within the range of about 0.20 to about 0.70% and the Cu/Ni quantity ratio in case of the presence of both elements being limited at most 1;
b) heating said feed ingots to a temperature of about 1150 to about 1280°C and hot-rolling said ingots into tubes in multiple stages; and c) after leaving the last hot-rolling stage, quenching said tubes having a temperature above AC3 directly from the rolling heat in about 5 to about 50 seconds substantially avoiding formation of ferrite down to a temperature range of about 340-560°C and thereafter further cooling said tubes in air.
a) providing feed ingots of a steel annealed with aluminum and/or silicon, having the following composition in weight per cent:
0.08 - 0.13 % C
1.40 - 1.90 % Mn 0.20 - 0.50 % Cr 0 - 0.50 % Mo 0 - 0.70 % Ni 0 - 0.40 % Cu 0.04 - 0.13 % V
max. 0.020 % P
max. 0.010 % S
the balance being iron and impurities, the sum of the contents of Cr and Mo lying within the range of about 0.20 to about 0.70% and the Cu/Ni quantity ratio in case of the presence of both elements being limited at most 1;
b) heating said feed ingots to a temperature of about 1150 to about 1280°C and hot-rolling said ingots into tubes in multiple stages; and c) after leaving the last hot-rolling stage, quenching said tubes having a temperature above AC3 directly from the rolling heat in about 5 to about 50 seconds substantially avoiding formation of ferrite down to a temperature range of about 340-560°C and thereafter further cooling said tubes in air.
2. The method according to Claim 1, wherein at most about 0.04% by weight of Nb is added to said steel.
3. The method according to Claim 1, wherein at most about 0.04% by weight of Ti is added to said steel.
4. The method according to Claim 2, wherein at most 0.04% by weight of Ti is added to said steel.
5. The method according to Claim 1, wherein the ferrite formation does not exceed 10% by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2008853 CA2008853A1 (en) | 1990-01-30 | 1990-01-30 | Method of manufacturing of high-strength seamless steel tubes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2008853 CA2008853A1 (en) | 1990-01-30 | 1990-01-30 | Method of manufacturing of high-strength seamless steel tubes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2008853A1 true CA2008853A1 (en) | 1991-07-30 |
Family
ID=4144154
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2008853 Abandoned CA2008853A1 (en) | 1990-01-30 | 1990-01-30 | Method of manufacturing of high-strength seamless steel tubes |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2008853A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8512487B2 (en) * | 2003-10-20 | 2013-08-20 | Jfe Steel Corporation | Seamless expandable oil country tubular goods and manufacturing method thereof |
-
1990
- 1990-01-30 CA CA 2008853 patent/CA2008853A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8512487B2 (en) * | 2003-10-20 | 2013-08-20 | Jfe Steel Corporation | Seamless expandable oil country tubular goods and manufacturing method thereof |
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