Is é ASTM A36 (A36/A36M scríofa freisin) an ceann is mó a úsáidtear cruach struchtúrach ísealcharbóin le haghaidh plátaí, cruthanna, agus barraí i dtógáil táthaithe, boltaithe agus seamaithe. Tá tóir air mar go gceanglaíonn sé neart iontaofa, táthaitheacht / foirmiúlacht mhaith, infhaighteacht leathan, agus praghas réasúnta.
Cad a Clúdaíonn A36 (agus cad nach ndéanann sé)
- Scóip: Cruach struchtúrach carbóin le haghaidh plátaí, cruthanna, agus barraí a úsáidtear i struchtúir ghinearálta (foirgnimh, droichid, bunanna innealra, umair, scids). Is é A36 féin an grád ábhair; lamháltais ghinearálta tríthoiseach le haghaidh cruthanna/plátaí á rialú ag ASTM A6/A6M.
- Cén fáth go bhfuil sé uileláithreach: Táthaithe aige go héasca le próisis choiteanna (GMAW/SMAW/FCAW/SAW), foirmeacha fuar nó te gan fuss, agus meaisíní inghlactha le haghaidh páirteanna neamhchruinneas.
Comhdhéanamh Ceimiceach (teorainneacha tipiciúla)
| Eilimint | Uas / Raon* |
|---|---|
| Carbón (c) | ≤ ~0.25–0.29% |
| Mangainéis (MN) | ~0.80–1.20% |
| Fosfar (p) | ≤ 0.04% |
| Sulfair (í) | ≤ 0.05% |
| Silicon (IR) | ≤ 0.40% |
| Copar (Cu) | ~0.20% (nuair atá sé sonraithe) |
- Athraíonn teorainneacha beachta de réir foirm agus tiús an táirge—deimhnigh i gcónaí ar an Teastas Tástála Muileann (MTC). Foinsí a thugann achoimre ar na gnáthréimsí: Soláthar Miotail Tionscail, Cruach Octal, Miotail SAM.
Cad a chiallaíonn an cheimic go praiticiúil: Ísealcharbóin + measartha Mn ⇒ weldability maith agus insínteacht, ach teoranta trí-chruachan trí chóireáil teasa; má theastaíonn neart níos airde uait gan tiús a chur leis, de ghnáth déanann tú céim suas go dtí gráid HSLA (m.sh., A572).
Airíonna Meicniúla (tagairt)
- Neart toraidh (nóiméad): 36 ks (≈ 250 MPa)))
- Neart teanntachta (fuinneog tipiciúil): 58–80 ks (≈ 400–550 MPa)))
- Fadú: go coitianta ~20% (ag brath ar thiús/cruth)
Braitheann luachanna ar tiús agus foirm an táirge—pláta vs. cruthanna vs barra is féidir a bheith beagán difriúil. Ceannaigh chuig an sonra rialaithe i gcónaí agus athbhreithnigh an MTC.
Machinability & fabrication
- Innéacs meaisínitheachta ~72% (vs. 100% le haghaidh tagartha AISI 1112) le gnáthluasanna gearrtha ~120 tr/nóim—leordhóthanach le haghaidh obair ghinearálta, ach níl sé chomh héasca le 1018.
- Weldability: go héasca weldable le próisis choitianta; réamhthéamh íosta de ghnáth le haghaidh codanna tanaí go meánacha, faoi threoir ag dearadh comhpháirteach agus coibhéis carbóin.
Lamháltais Toiseacha
Tugann ASTM A36 an grád; ASTM A6/A6M tugann an lamháltais muileann le haghaidh cruthanna agus plátaí struchtúracha (díreach, camóg, casadh, tiús, leithead/fad). Go hiondúil cuireann dearthóirí agus ceannaitheoirí táblaí Lámhleabhar AISC a dhíorthaítear ó A6 i bhfeidhm nuair a bhíonn riosca feistiú á sheiceáil acu.
Product Forms & Common Supply Conditions
- Plátaí Is é sin le ráAD, often P&O), bíomaí leathana, cainéil, uillinneacha, barraí (árasáin, babhtaí, cearnóga), agus bearnaí lasair-ghearrtha nó léasair-ghearrtha. Tá an dromchla scála muileann i riocht mar-rollta; picilte, pléascadh/priming ar fáil.
Gráid Struchtúrtha A36 vs
A36 vs. A572 Grád 50 (HSLA)
- A572 Gr50 tá neart toraidh níos airde (50 ksi) agus neart le meáchan níos fearr; Tá sé níos fusa A36 a fhoirmiú agus de ghnáth níos saoire. Freastalaíonn siad ar mhargaí den chineál céanna (pláta, cruthanna) ach nach bhfuil idirmhalartaithe gan dearadh a athsheiceáil.
For general structural purposes, engineers often cross-reference A36 with “~235–250 MPa yield” steels:
| System | Grade (typical) | Tuairim |
|---|---|---|
| GA 10025-2 | S235JR | Very close strength window to A36; JR adds a Charpy impact level (27 J @ +20 °C) that A36 itself doesn’t mandate. |
| Sé g3101 | SS400 | Common Asian mild steel; strength ranges overlap A36. |
| GB/T 700 | C235b | PRC structural steel near 235 MPa yield. (Use local code rules.) |
Substitution caution: “Equivalent” ≠ “identical.” Check impact class (JR/J0/J2), thickness windows, and project code rules before swapping.
Iarratais tipiciúla
- Buildings & bridges: beams, columns, bracing, base plates
- OEM/industrial: equipment skids, frames, guards, platforms, tanks
- Bonneagar: stairs, handrails, gratings (with proper coating)
- Service centers & fab shops: general‐purpose plate and shape stock due to workability & cost
Sizing & Purchasing Checklist
- Grade & spec: ASTM A36/A36M
- Product form & size: plate/shape/bar, thickness, width, length (or section size)
- Tolerances: per ASTM A6/A6M (note any special straightness/flatness)
- Surface condition: as-rolled, P&O, blasted/primed, or galvanized
- Weld procedure constraints (if any) and NDT requirements
- Test documents: EN 10204 3.1 MTC with chemistry + mechanicals
- Coating/painting/galvanizing notes and packaging
- Quantity, Incoterms, destination port
Ceisteanna Coitianta
Is A36 heat-treatable for higher strength?
Only to a limited extent: with its low carbon, A36 does nach bhfuil significantly through-harden like alloy steels. If you need strength above A36 without adding thickness, consider A572 or other HSLA grades.
What are the most common A36 plate thicknesses?
Service-center inventories vary by region, but A36 plate commonly spans thin gauges up to heavy thicknesses for structural use; check local stock lists. (Ryerson/Kloeckner overviews.)
How “close” is S235JR to A36?
Very close in yield/tensile windows for general use, but S235JR has a defined impact requirement; many EU projects therefore specify S235JR rather than A36. Always follow the project code.
What standards control shape/plate tolerances?
ASTM A6/A6M for carbon structural shapes and plates; AISC Manual reproduces key tables commonly used by designers/fabricators.
How easy is A36 to machine and weld?
Weldability is excellent with common processes; machinability ~72% with typical speeds around 120 ft/min—fine for general work, but 1018 machines cleaner if precision finish matters.
A36 vs A572: quick chooser
- Pioc A36 faoi cost-effective, easy forming/welding in low-to-moderate stress structures.
- Pioc A572 Gr50 nuair is gá duit níos airde (lighter sections for the same capacity) and better strength-to-weight. Re-check design if substituting.
Gengfei Provides High Quality ASTM A36 Steel
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