Kurukuruwa Bar

Kurukuruwa (dade kurukuruwa) .ne adade a ɛyɛ den a ɛyɛ kurukuruwa a wɔde yɛ adewɔde ma wɔ ne tenten a ɛyɛ tẽẽ mu, a wɔkyerɛkyerɛ mu titiriw denam nediameter a ɛyɛ kɛse(sɛ nhwɛso no, Ø12 mm) ne tebea a wɔde ma (hot-rolled, normalized, anaasɛ quenched & tempered). Nea ɛnte sɛ paipu anaa tube no, ɛwɔbore a ɛyɛ tokuru biara nni hɔ-wɔde di dwuma sɛ raw stock mamfiri a wɔde yɛ, forging, ne fabricationsɛ wɔbɛyɛ shafts, pins, bolts, couplings, ne structural/mechanical components.

 

Octal Pipe de alloy ne dade soronko mannua a ɛyɛ kurukuruwaa Chinafoɔ dadeɛ afiri akɛseɛ soronko-yɛ, a ne ntwemu firi5 mm kosi 360 mm, wɔde ma wɔ ɔhyew-roled, normalized, anaa quenched-ne-tempered tebea mu. Wɔayɛ saa bars yi ama adetɔfoɔ a wɔyɛ machining, forging, ne part manufacturing wɔ sectors te sɛ energy, mining, offshore, transportation ne general machinery.

Nhwɛso (MTC-a wɔtaa akyi):Mill adansedie krataa a ɛwɔ aseɛ ha (Ø27 mm × 6 m, 35.916 t nyinaa) kyerɛ micro-alloyed round bar dadeɛ chemistry ne mfiridwuma level a wɔtaa de di dwuma ma afã a ɛhwehwɛ. chemistry: bɛyɛ 0.33–0.34% C, P a ɛba fam ( Ennu anaasɛ ɛyɛ pɛ 0.017%) ne S a ɛba fam ( Ennu anaasɛ ɛyɛ pɛ 0.004%), ne micro-alloying elements V, Ti ne B. Saa nkabom no kyerɛ yɛn sɛ eyi yɛnadansi dade titiriw bi, nanso aa ɛkorɔn-ahoɔden, fine-aburow, micro-alloyed barwɔayɛ ama afã horow a ehia ahoɔden (≈950 MPa tensile) ne impact toughness wɔ –20℃nyinaa . Bars te sɛ eyi yɛ papa sɛ raw stock ma bolts, shafts, pins, drivetrain afã horow, drilling ne mining components.

 

Wobetumi de bars nyinaa amatraceability a edi mũ(ɔhyew dodow, nnuru a ɛwɔ mu, tensile sɔhwɛ, impact sɔhwɛ, bend/rebend ne hardness) sɛnea EN 10204 3.1/3.2 kyerɛ no.

 

 

 

 

Aguade ahorow no su	Size range a ɛwɔ hɔ
Hot-roled kurukuruwa bar	5 – 360 mm
Bar a ɛyɛ tratraa	Ne tɛtrɛtɛ yɛ mm 50 – 810, ne kɛse yɛ mm 6 – 160
Square bar a ɛyɛ ahinanan	150 mm, 200 mm, 250 mm, 280 mm

 

Sɛ wopɛ adetɔ ho nkyerɛwde tiawa a, .kurukuruwa a ɛyɛ 12mmyɛ adwumayɛbea kɛse a wɔtaa de yɛ shaft nketewa, pin, ne brackets, bere akurukuruwa a ɛyɛ kurukuruwa R6wɔtaa de di dwuma wɔ site list ahorow so de kyerɛØ6 mm kurukuruwa a ɛyɛ kurukuruwa(mfonini ahorow bi de "R" di dwuma sɛ radius-enti si so dua sɛ R6 kyerɛ Ø6 anaa radius 6).

 

Common round bar sizes (mm) a wɔde di dwuma wɔ machining & site fabrication:

 

Bar a ɛyɛ kurukuruwa kɛse (mm) .	Sɛnea wɔtaa de di dwuma wɔ beae hɔ (adwuma ankasa) .
6 (R6) / 8 / 10	Pin nketewa, anchor nneɛma, kanea brackets, jig afã horow
12 (kurukuruwa a ɛyɛ 12mm) . / 16 / 20	General shafts, nsateaa, adapters, asiesie afã horow
25 / 30 / 40	Couplings, drive components, mfiri a wɔde yɛ hubs
50 / 60 / 80	Heavy-duty pins, mining wear afã horow, forged blanks
100+	Mfiridwuma stock akɛse, amanne kwan so atoro afã horow

 

 

 

Efi MTC a wode kɔe no so (Heat No. 0242306413 / 0242306412, dia. 27 mm × 6 m), wɔbɔ nnuruyɛ no ho amanneɛ te sɛ eyi:

 

Adeɛ	Sɔhwɛ 1	Sɔhwɛ 2	Unit / nsɛm a wɔka
C	0.33	0.34	% (x100 → 33 / 34)
Si	0.28	0.26	%
Mn	0.68	0.57	%
P	0.015	0.017	% (P a ɛba fam yiye, toughness pa) .
S	0.003	0.004	% (S a ɛba fam yiye, ahotew pa) .
Cr	0.018	0.021	% (micro Cr) .
Cu	0.009	0.005	%
V	0.063	0.066	% (micro-alloying a wɔde hyɛ mu den)
Ti	0.042	0.043	% (aburow a wɔayɛ no yiye) .
B	0.0030	0.0030	% (hardenability nkɔsoɔ) .

 

Nea eyi ka kyerɛ yɛn

Carbon bɛyɛ 0.33–0.34% ma ahoɔden ne denden a ɛkari pɛ yiye wɔ QT akyi.

P ne S sua koraa ( Ennu anaasɛ ɛne 0.017% yɛ pɛ na Ennu anaasɛ ɛyɛ pɛ 0.004%), a ɛyɛ dade a wɔde yɛ nneɛma soronko-ma mfiri afã horow no su.

V, Ti ne B wɔ hɔ pefee - eyi nyɛ mfitiase dade a ɛyɛ mmerɛw, na mmom micro-alloyed anaa HS (high-ahoɔden) bar a wɔde asi mfiridwuma su a ɛkorɔn ne hardenability pa so.

Nkyerɛwde a ɛwɔ MTC no so no kyerɛ sɛCEV aduru a wɔde yɛ nnuru:
CEV=C + Mn/6 + (Cr + V + Mo) / 5 + (Cu + Ni)/15
a ɛyɛ ɔkwan a wɔtaa fa so di weldability ne awɔw-cracking asiane so. Eyi yɛ nsɛm pa a ɛsɛ sɛ wode sie krataafa no so efisɛ ɛkyerɛ mfiridwumayɛfo ne Google sɛ eyi yɛ mill data ankasa.

 

 

Wɔ da{0}}da{1}}da adetɔ mu no, .kurukuruwa bar vs pomane mpɛn pii no asupply-form ne gye a wogye tomnsonsonoe mmom sen sɛ ɛbɛyɛ nsonsonoe a ɛwɔ nnuruyɛ mu.Bar a ɛyɛ kurukuruwampɛn pii no ɛkyerɛ tẽẽ-tenten, solid bar stock a wɔde ma machining ne forging, baabidiameter tolerance, tẽẽ, ne soro tebeatẽẽ nya cycle bere ne scrap rate so nkɛntɛnso. "Aba" wɔtaa de di dwuma wɔ ɔkwan a ɛnyɛ den so ma diameters nketewa na, egyina nnwuma no so no, ebetumi akyerɛcoil-fed wire-rod nsusuwii ahorow(wɔayɛ sɛ wɔde bɛtwetwe, abɔ, anaa wɔde kyekyere waya akwan) sen sɛ wɔbɛtwa-tenten bar.

Ɔkwan a mfaso wɔ so a wobɛfa so atetew wɔn mu ne sɛ wobɛhwɛ nea ɛho hia wɔ gye a wogye mu:

 

• Sɛ wuhia atwa-kɔ-tenten blanks ma dannan/boring, wotaa tɔkurukuruwa bar-wobɛdwene hotẽẽ, decarb, ɔfasu sintɔ, ne diameter a ɛkɔ so daaenti ɔfã mfiri no ho tew.
• Sɛ wo anammɔn a edi hɔ nemfonini/nsusuwii(waya nneɛma, nsuten, fastener waya, coil-fed dwumadie), "aba" ne asɛmfua a wɔtaa de di dwuma, na adwene no dan kɔ."coil form, soro nsenia sohwɛ, ne drawability.

 

Kasa a wɔtaa de tɔ (ɛboa ma wɔkwati PO a emu nna hɔ):

 

• Fa di dwuma"kurukuruwa kurukuruwa".bere a wo BOM hwɛ kwan noØ kɛse + tenten(sɛ nhwɛso no, Ø20 × 6 m) na wo downstream nhyehyɛe no yɛ machining/forging.
• Fa di dwuma"poma / waya poma".bere a wo BOM hwɛ kwan nocoil/weight-gyina so de mana adeyɛ a ɛkɔ fam no reyɛ twetwe anaasɛ ɛreyɛ.

 

Adetɔ ho afotu a mfaso wɔ so:krakurukuruwa barbere a wuhia machining stock a wotumi hyɛ ho nkɔm ne stable straightness; fa "rod" nsɛmfua di dwuma bere a wo nhyehyɛe no yɛ coil-fed drawing, bending, anaa wire-based forming nkutoo.

 

 

Sɛnea ɛbɛyɛ a kratafa no bɛyɛ te sɛ nea ɛwɔ tumi no, ɛboa ma wɔkyerɛ sɛnea wɔyɛ no ankasa. Ɔkwan a wɔtaa fa so fa saa nnua kurukuruwa a ahoɔden kɛse -fa so ne nea edidi so yi:

a) Dade a wɔyɛ ne nea ɛto so abien a wɔde yɛ nneɛma foforo
Wɔbɔ dade wɔ BOF anaa EAF mu, afei wɔde LF/VD yɛ ho adwuma de yi sulfur ne phosphorus fi mu na wɔsesa aduru a wɔde afrafra no pɛpɛɛpɛ. Eyi ne baabi a wɔde micro-alloying elements te sɛ V, Ti ne B ka ho. P ne S a ɛba fam wɔ wo MTC mu (0.015–0.017% P, 0.003–0.004% S) yɛ nea efi anammɔn yi mu ba pɛpɛɛpɛ - wɔma toughness ne weldability tu mpɔn.

b) Casting ne billet ahosiesie
Wɔtow dade a wɔayɛ no yiye no gu billets a ɛfata ma rolling round bar. Billets a ɛho tew a nea ɛka ho sua no ho hia na ama woatumi atwa bend/rebend ne impact sɔhwɛ ahorow a epue wɔ wo adansedi krataa no so no mu.

c) Hot rolling a ɛyɛ kurukuruwa bar
Wɔsan yɛ Billets hyew na wɔbobɔw wɔ bar mills so kosi ne kɛse a etwa to (sɛ nhwɛso no, mm 27). Wɔhwɛ rolling so na ama wɔanya soro su pa, tẽẽ ne dimensional tolerance. Wɔtwitwa nnua no tenten ma ɛyɛ aguadi, mpɛn pii no ɛyɛ mita 6.

d) Ɔhyew a wɔde sa yare (normalizing anaa quenching + tempering) .
Sɛ wobɛduru mfiridwuma su a wɔakyerɛ wɔ adansedie krataa no so - tensile 950–960 MPa, yield bɛyɛ 905–915 MPa, impact ahoɔden wɔ –20℃bɛyɛ 100–110 J - bars no nnya "sɛ ɔhyew rolled". Wɔma wɔyɛ no sɛnea ɛsɛ anaasɛ, mpɛn pii no wɔ ahoɔden dodow yi ho no, .wɔadum na wɔayɛ no hyew (Q&T) ..

Cunching a wɔde dumma martensitic/bainitic nhyehyɛe a ɛyɛ den.

Tempering a wɔde hyɛ obi sowɔ ɔhyew a ɛfata mu no ɛma ductility san ba, ɛma impact toughness kɔ soro, na ɛma microstructure no gyina pintinn.
Saa anammɔn yi ne deɛ ɛma ahoɔden no kɔ soro nanso ɛda so ara ma elongation kɔ so yɛ bɛyɛ 13–14% ne beaeɛ a ɛso tew boro 50%.

e) Nteɛteɛ, twa ne agyiraehyɛde
Sɛ wɔde ɔhyew ayɛ akyi a, wɔteɛ nnua no, twa no kɔ mita 6 (anaasɛ ne tenten afoforo a wɔahyɛ da ayɛ), wɔboaboa ano na wɔde ɔhyew nɔma hyɛ no agyirae.

f) Sɔhwɛ ne adansedie
Nea ɔyɛ no yɛ nnuru nhwehwɛmu, tensile sɔhwɛ, impact test wɔ –20℃, bend/rebend sɔhwɛ, forging sɔhwɛ ne hardness check - adum a wuhu wɔ MTC no nyinaa. Bere a wɔn nyinaa "fata" nkutoo na wogyae bars no. Eyi ma adetɔfo nya ahotoso sɛ bundle biara di mfiri dodow a wɔapene so no ho.

 

 

 

Kurukuruwa bar dade haw dodow no ara nkyerɛ wɔ quotation krataa no so-wɔda adiwɔ lathe no so, bere a wɔde ɔhyew ayɛ ho adwuma awie, anaasɛ bere a wɔreboaboa ano no. Wɔ nnwuma a wɔde high-ahoɔden / micro-alloyed bar di dwuma no, Octal Pipe twe adwene si nsɛntitiriw a mfaso wɔ so a ɛkyerɛ sɛ ebia bar no bɛyɛ ɔfã a ɛyɛ den anaasɛ ade a ne bo yɛ den a wɔsan yɛ no foforo:

 

Nea ɛtaa nkɔ yiye wɔ beae hɔ	Nea ɛsɛ sɛ wɔkyerɛ (adetɔfo kasa) .	Nea Octal Pipe di so wɔ owiyammo no mu
Adwinnade a wɔnhwɛ kwan sɛe / tetew wie	Delivery tebea + soro ahwehwɛde (hot-rolled / peeled / drawn) .	Ɔkwan a wɔfa so siesie asase ani (sɛ nhwɛso no, peeling baabi a ɛho hia) + straightening de tew machining nsakrae so
Dimensional drift akyi mfiri	Diameter tolerance + tẽẽyɛ ahwehwɛde	OD/ovality + straightness checks na ama wɔakɔ so ayɛ turning allowance a wɔahyɛ ho nkɔm
Krataa a ɛpaapae bere a awɔw fi ase / nkɛntɛnso nsɛm a esisi	Nkɛntɛnso ahoɔden wɔ ɔhyew a wɔakyerɛ mu (sɛ nhwɛso no, "CVN @ -20℃") .	Nsunsuansoɔ sɔhwɛ a ɛbata ɔhyew/dodow ho; yi a egyina sɔhwɛ adanse so, na ɛnyɛ nsusuwii ahorow so
Ɔhyew-treat mismatch (ɛyɛ den dodo / ɛyɛ mmerɛw dodo) .	Ɔhyew ayaresa tebea (normalized / Q&T) + hardness mfɛnsere	Ɔhyew-ayaresa nteɛso + hardness nokwaredi tia mfɛnsere a wɔakyerɛ no
Mfomso ahorow a ahintaw a wohuu akyiri yi	NDT scope sɛ ɛho hia a (UT denam apam so) .	UT option ma afã horow a ɛho hia + traceable repair/re-test records wɔ baabi a ɛfata

 

Wɔ nneyɛe mu no, eyi dan "round bar size + grade" ma ɛyɛ aadwuma a wɔde yɛ nneɛma a wɔde yɛ nneɛma: bar no ba a tebea a wɔakyerɛkyerɛ mu, mfiri nneyɛe a wotumi hyɛ ho nkɔm, ne nnyinaso a wɔde gyae a ɛne sɛnea wogye afã horow no tom ankasa hyia. Octal Pipe betumi aboa lot-based traceability (ɔhyew nɔma → sɔhwɛ aba) enti gye nhwehwɛmu ne downstream machining qualification kɔ ntɛmntɛm a enni sampling cycles foforo.

 

 

Efisɛ saa nsɛm yi ka bomahoɔden a ɛkorɔn (≈950 MPa) ., ductility a ntease wom (A ≈ 13–14%) .nepapa paa a ɛba fam-ɔhyew nkɛntɛnso ahoɔden (bɛyɛ 100–110 J wɔ –20 digrii ) ., wobetumi de adi dwuma wɔ afã horow pii a ɛyɛ den mu:

Mining, tunneling ne asase{0}}mmoa afã horow
Abotan bolts, anchor rods, drill rods ne afã afoforo a ɛsɛ sɛ ɛyɛ adwuma wɔ awɔw anaa impact-loaded tebea mu. Nnɔbaeɛ a ɛkɔ soro (≈910 MPa) ne nsunsuansoɔ boɔ pa ma bar no yɛ dwoodwoo wɔ shock loads ase.

Oil & gas ne nneɛma a ɛwɔ mpoano
Afã horow, flanges, hubs, shafts ne brackets a wɔde bɛka abom wɔ baabi a low-temperature toughness yɛ ahyɛde (–20℃anaa nea ɛba fam). P/S dodow a ɛba fam ne sɔhwɛ ahorow a wɔakyerɛw ato hɔ no ma ɛyɛ mmerɛw sɛ wobegye atom wɔ mpoano ne po so nnwuma mu.

Mfiri ne tumi-adwinnade afã horow
Shafts, axles, pins, gears (bere a wɔayɛ no foforo anaasɛ wɔayɛ no den akyi), mfiri no frame ne transmission components a ehia ahoɔden a ɛkorɔn sen carbon dade a ɛyɛ mmerɛw.

Keteke ne kar a emu yɛ duru-kar afã horow
Baabi a ɛho hia sɛ wɔyɛ nnuru a ɛkɔ so daa no, traceability ne weldability (controlled CEV) ho hia.

Forging stock ne mfiri a wɔde yɛ adwuma
Esiane sɛ nnuru no ho tew na wɔayɛ nhyehyɛe no yiye nti, bar no yɛ nnyinaso pa ma closed-die forgings anaa mfiri afã horow. Adetɔfoɔ tumi forge sɛ shape na wɔda so ara kura mfiridwuma level no re-tempering akyi.

Nnwuma a wɔyɛ wɔ mmeae a awɔw wom
Nsunsuansoɔ ahoɔden a wɔada no adi wɔ –20℃wɔ MTC so no kyerɛ sɛ wɔbɛtumi de saa nnua yi adi dwuma wɔ atifi / ɔhyew a ɛba fam-tenaeɛ a ɛnyɛ brittle huammɔdi.

 

Stainless Steel Kurukuruwa Bar

Wɔ corrosion-exposed components ho no, projects betumi akyerɛdade a ɛnyɛ den a ɛyɛ kurukuruwammom sen sɛ wɔde carbon/alloy bedi dwumadade a ɛyɛ kurukuruwa a wɔde bar ayɛ-taa yɛ bere a nnuru a wɔde hohoro nneɛma, mpoano nsuo, anaa chloride-bearing media ma coating-based protection yɛ nea wontumi mfa ho nto so. Octal Pipe betumi afa stainless round bar nneɛma aka alloy bar packages ho sɛnea ɛbɛyɛ a adetɔfo betumi de krataa biako a wɔahyehyɛ ne shipment nhyehyɛe biako asie. Nneɛma a wɔtaa paw a ɛnyɛ stainless no bi ne 304/304L a ɛko tia nsɛe wɔ ɔkwan a ɛkɔ akyiri so ne 316/316L a ɛho hia sɛ chloride pitting margin.

 

Di nkitaho mprempren

 

 

Adeɛ	Nkyerɛmu
Ntrɛwmu	5 – 360 mm (ɔhyew-a wɔabobɔw); a wɔayɛ no atoro anaasɛ wɔayɛ no kɛse bere a wɔabisa no
Tenten	6 m typical, 3–12 m betumi ayɛ nhyehyɛe
Delivery tebea	Sɛnea wɔabobɔw, normalized, Q&T
Gyinapɛn ahorow a yebetumi ne no ahyia	GB/T, ASTM/AISI, EN, po so ahyɛn a wɔyɛ anaa adetɔfo mfonini
Nwoma a wɔde kyerɛw	Mill sɔhwɛ adansedi krataa (chemistry + mechanicals + impact), packing list, mfiase
Nhwehwɛmu a wɔyɛ	Wobetumi ayɛ nhyehyɛe ama obi a ɔto so abiɛsa-(SGS / BV) ansa na wɔde amena

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