Round Bar a ni

Bar round (thir bar zungbun) .tih a ni asolid cylindrical steel atanga siam a nisupplied in straight lengths, a sawifiah ber chu adiameter a ni(eg, Ø12 mm) leh delivery condition (hot-rolled, normalized, emaw quenched & tempered) te a ni. Pipe emaw tube emaw ang lo takin a neihollow bore a awm lo-a raw stock atan hman a nimachining, forging, leh thil siam chhuah te a nishaft, pin, bolt, coupling, leh structural/mechanical component siam nan.

Octal Pipe hian alloy leh special steel a pe chhuak thinbar zungbun (round bar) a awmChinese special-steel mill lian tak tak siam chhuah, diameter atanga5 mm atanga 360 mm thleng a ni, hot-rolled, normalized, emaw quenched-leh-tempered condition-a pek chhuah a ni. Heng bar te hi energy, mining, offshore, transportation leh general machinery ang chi sector hrang hranga machining, forging, leh part manufacturing ti thin customer te tan siam a ni.

Entirnan (MTC-backed):A hnuaia mill certificate (Ø27 mm × 6 m, 35.916 t total) hian micro-alloyed round bar steel chemistry leh mechanical level pangngai, part mamawhna atana hman thin a entir a ni. chemistry: 0.33–0.34% C vel, P hniam (<=0.017%) leh low S (<=0.004%), plus micro-alloying elements V, Ti leh B. Chu inzawmkhawm chuan hei hi a ni tih min hrilh a niloa basic construction steel, mahse asang-chakna, fine-grain, micro-alloyed barchakna (≈950 MPa tensile) leh –20 degree-a impact toughness pahnih mamawh part-te tan ruahman a ni. Hetiang bar hi bolt, shaft, pin, drivetrain parts, drilling leh mining components atan raw stock atan a tha hle.

Bar zawng zawng hi supply theih a nitraceability kimchang tak a awm(heat number, chemical composition, tensile test, impact test, bend/rebend leh hardness) tih angin EN 10204 3.1/3.2.

Procurement shorthand atan chuan, .round bar chu 12mm a nichu shaft te, pin, leh bracket te tan workshop size hman tlanglawn tak a ni a, chutih laiinround bar R6 a nitih hi site list-ah chuan sawina atan hman a ni foØ6 mm round bar a ni(drawing thenkhatah chuan "R" hi radius atan an hmang-chuvangin R6 hian Ø6 emaw radius 6 emaw a kawk tih finfiah rawh).

Machining & site siamna atana hman tlanglawn round bar size (mm) te chu:

MTC i thawn atang khan (Heat No. 0242306413 / 0242306412, dia. 27 mm × 6 m), chemistry chu hetiang hian report a ni:

Hei hian eng nge min hrilh

Carbon 0.33–0.34% vel hian QT hnuah chakna leh toughness balance tha tak a pe a ni.

P leh S hi a hniam hle (<=0.017% and<=0.004%), hei hi mechanical parts atana special-steel bars hman dan tlangpui a ni.

V, Ti leh B te hi chiang takin an awm - hei hi basic mild steel a ni lo va, micro-alloyed emaw HS (high-strength) bar a ni a, mechanical property sang tak leh hardenability tha tak neih tum a ni.

MTC-a note-ah chuan...CEV formula hmanga siam a ni:
CEV=C + Mn/6 + (Cr+V+Mo)/5 + (Cu+Ni)/15
chu chu weldability leh cold-cracking risk control dan tlangpui a ni. Hei hi page-a dah tur information tha tak a ni a, a chhan chu engineer te leh Google te hnenah hei hi mill data tak tak a nih thu signal a pe a ni.

Ni-ni{1}}ni tin thil leinaah, .round bar vs rod a nia ni tlangpui asupply-form leh pawm theihnachemistry danglamna aiin inthliarna a ni zawk.Bar round tak a nia tlangpuiin straight-length, solid bar stock machining leh forging atana supply tihna a ni a, chutah chuandiameter tolerance, a dinglam, leh a chunglam dinhmun tecycle time leh scrap rate direct-in a nghawng a ni. " "Hmawlh" hi diameter tenau zawk tan chuan a zalen zawkin hman a ni fo a, industry a zirin a sawi thei bawkcoil-feed wire-rod siam a ni(wire route drawing, bending, emaw fastener atana ruahman) ai chuan cut-length bar aiin.

An inthen theihna kawng tangkai tak chu dawng tura thil pawimawhte en hi a ni:

• I mamawh chuancut-to-length blanks turning/boring atan, i lei tlangpuiround bar a ni-i ngaihtuah ve mai angstraightness, decarb, surface defects, leh consistent diameter te a awm bawkchuvangin part machine te chu a fai hle.
• I hmabak tur chulemziak/forming siam(wire thil siam, spring, fastener wire, coil-fed processing), "hmawlh" tih hi hman a ni fo va, ngaihtuahna chu a inthlak a nicoil form, surface scale control, leh drawability te a ni.

Typical buyer language (PO ambiguity awm loh nan a pui):

• Hmang"round bar" tih a ni.i BOM beisei hunahØ size + a sei zawng(eg, Ø20 × 6 m) leh i downstream process chu machining/forging a ni.
• Hmang"rod / wire rod" tih a ni.i BOM beisei hunahcoil/weight-a innghat supply a nileh downstream process chu drawing emaw forming emaw a ni.

Thil lei theihna tur tip tangkai tak:thupekround bar a nimachining stock predictable leh stable straightness i mamawh hunah; i process chu coil-fed drawing, bending, emaw wire-based forming a nih chauhvin "rod" wording hmang rawh.

Page chu thuneihna nei anga lang turin, a kalphung tak tak lantir nan a pui thin. Heng high-strength round bars te tan hian kawng tlangpui chu hetiang hi a ni:

a) Steel siam leh secondary refining
Steel hi BOF emaw EAF emaw-ah an hmin a, chutah chuan LF/VD-ah an treat a, sulfur leh phosphorus te chu paih chhuakin alloy awm zat dik taka siamrem a ni. Hei hi micro-alloying elements V, Ti leh B te dahna hmun a ni. I MTC-a P leh S hniam (0.015–0.017% P, 0.003–0.004% S) hi he step - atanga lo chhuak chiah a ni a, toughness leh weldability an ti tha zawk a ni.

b) Casting leh billet buatsaih dan
Refined steel chu rolling round bar atana hman tlâk billet-ah an paih a ni. I certificate-a bend/rebend leh impact test-a langte pass tur chuan inclusion content hniam tak nei billet thianghlim hi a pawimawh hle.

c) Bar round tak chu hot rolling a ni
Billets te chu an lum leh a, bar mill-ah a tawp ber (entir nan, 27 mm) thlengin an roll a. Rolling hi control a ni a, surface quality tha tak, straightness leh dimensional tolerance tha tak a awm theih nan. Bar te hi sumdawnna atana sei zawnga tan a ni a, a tlangpuiin 6 m.

d) A lumna hmanga enkawl (normalizing emaw quenching + tempering) .
Certificate-a tarlan mechanical property - tensile 950–960 MPa thleng tur chuan, yield 905–915 MPa vel, impact energy –20 degree-a 100–110 J vel - bar-te chu "as hot rolled"-a dah a ni lo. An normalized emaw, a tam zawkah chuan he chakna level atan hian .quenched leh tempered (Q&T) a ni..

Quenching a nimartensitic/bainitic structure khauh tak a pe.

Tempering tih a nitemperature dik takah chuan ductility a siam tha leh a, impact toughness a tisang a, microstructure a ti nghet bawk.
He step hian chakna a ti sang a, mahse elongation chu 13–14% vel ah a la vawng reng a, area tihtlem chu 50% aia sang a ni.

e) Dinglam, cut leh marking
Heat treatment hnuah bars te chu an dinglam a, 6 m (or ordered lengths dang) thlengin an cut a, bundle a ni a, heat number hmangin an mark bawk.

f) Test leh certification pek
Producer hian MTC-a column i hmuh zawng zawng hi chemical analysis, tensile test, impact test at –20℃, bend/rebend test, forging test leh hardness check - a ti vek a ni. An vai hian "qualified" an nih chauhvin bar te chu an chhuah thin. Hei hian bunder tin hian agreed mechanical level a tlin tih rinna a pe a ni.

Round bar steel problem tam zawk hi quotation sheet-ah a lang lo-an langlathe-ah emaw, heat treatment hnuah emaw, assembly laiin emaw. High-strength / micro-alloyed bar hmanga project-te tan chuan Octal Pipe hian bar chu stable part a nih leh nih loh rework item man to tak a nih leh nih loh tichiangtu practical quality point-te a ngaihtuah ber a ni:

A taka hman chuan hei hian "round bar size + grade" chu ahnathawh theihna tur production input: bar chu condition ruat sa, machining behavior predictable, leh parts pawm tak tak dan nena inmil release basis nen a lo thleng thin. Octal Pipe hian lot-based traceability (heat number → test result) a support thei a, chuvangin inspection dawngtu leh downstream machining qualification te chu extra sampling cycle awm lovin an kal chak zawk a ni.

A chhan chu he material hi a inzawm khawm a nichakna sang tak (≈950 MPa) ., ductility dik tak (A ≈ 13–14%) a ni.leha tha hle a, low-temperature impact energy (100–110 J vel –20℃ah ) ., a mamawhna hmun hrang hrangah hman theih a ni:

Mining, tunneling leh ground-support components te a awm bawk
Rock bolt, anchor rod, drill rod leh thil dang, khaw lum emaw, impact-loaded emawa hnathawk tur. Yield sang (≈910 MPa) leh impact value tha tak hian shock load hnuaiah bar hi a him a ni.

Oil & gas leh tuipui kama hmanrua te
Low-temperature toughness (–20℃emaw a aia hniam) awmna hmuna part, flange, hub, shaft leh bracket inzawmkhawm. P/S level hniam leh documented test te hian offshore leh marine project-ah pawm a awlsam phah hle.

Mechanical leh power-equipment part hrang hrang
Shaft, axle, pin, gear (machining dang emaw surface hardening emaw hnuah), machine frame leh transmission component te chu carbon steel pangngai aia chakna sang zawk mamawh a ni.

Rel kawng leh lirthei rit-a component hrang hrangte
Chemistry inmil tak, traceability leh weldability (controlled CEV) mamawhna hmunah chuan.

Forging stock leh machining bar te a awm bawk
Chemistry a thianghlim a, a structure pawh a refined avangin bar hi closed-die forgings emaw machined parts emaw atan base tha tak a ni. Customer te chuan forge to shape an ti thei a, re-tempering hnuah pawh mechanical level chu an la vawng reng thei bawk.

Hmun lum hmuna project hrang hrangte
MTC-a –20 degree-a impact energy finfiah tawh chuan heng bar te hi hmar lam / low-temperature environment-ah brittle failure awm lovin hman theih a nih thu a tarlang.

Stainless Steel atanga siam Bar Round a ni

Corrosion-exposed components tan chuan project-te chuan an tarlang theistainless steel hmanga siam a ni a, bar round tak a nicarbon/alloy ai chuanround bar steel hmanga siam a ni-a tlangpuiin washdown chemical, tuipui kama humidity, emaw chloride-bearing media-in coating-based protection rintlak loh a siam hian. Octal Pipe hian alloy bar package rualin stainless round bar items a quote thei a, chuvangin lei duhtute chuan document set pakhat leh shipment plan pakhat an vawng thei a ni. Stainless duhthlan tur tlanglawn tak chu general corrosion resistance atan 304/304L leh chloride pitting margin mamawhna hmunah 316/316L te a ni.

Tunah hian biak theih reng e

FAQ

 

 

Hot-rolled, peeled, leh cold-drawn round bar te hi eng nge an danglamna?

Hot-rolled hi stock man tlawm tak a ni a;peeled a nimachining atan surface/diameter consistency a ti tha a;cold-drawn a niprecision parts tan tolerance leh straightness a tikhauh.

Normalized emaw quenched & tempered (Q&T) condition-ah round bar order tur em ni?

Hmangnormalized a nimachining/forging input nghet tak tak siamna atan; hmangQ&Tpart chuan heat treatment hnua strength/toughness level tihfel leh controlled hardness a mamawh hunah.

Machining atana hman tur round bar tan eng tolerance nge ka tarlan ang?

Drawing-ah a sawi loh chuan, site-a fit-up leh extra turning allowance awm loh nan diameter tolerance class leh straightness requirement (leh machined/peeled surface a ngai em tih) tarlang rawh.

Round bar steel atan ultrasonic testing (UT) ka mamawh em?

UT hi a tlangpuiin critical shaft/forging stock atan a ni a, chutah chuan internal soundness a pawimawh a; machining hnua chhiatna hmuhchhuah a nih chuan late-stage scrap tihtlem nan a pui thin.

Certification pek chhuah a ni

 

CE Certificate neih a ni

ISO 9001 Certificate a ni

API Q1 Certificate a ni

ABS Certificate a awm bawk

AP-5L Certificate pek a ni

API-5CT Certificate pek a ni

 

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