Planti ol 'procurement' menesa i save lukluk tasol long prais bilong wan wan ton bilong'weathering steel'. Ol i save toktok strong, putim wanpela gutpela prais, na wetim sipmen. Tasol taim ol plet i kamap, ol i lusim planti tausen dola.
Bilong wanem? Long wanem, ol i no tingim tru ol 'thickness tolerances'.
Insait long wok bisnis bilong ain, pasin bilong karim hevi em i no wanpela liklik samting tasol. Em i narapela samting tru namel long mekim winmani na kisim bikpela lus long projek bilong yu. Sapos yu baim Corten o ol 'weathering steel plates' bilong wokim bris, wanpela 'retaining wall', o 'solar racking', yu mas save long hau ol 'mills' i save rolim dispela samting na hau ol 'standard tolerances' i save mekim wanem long laspela pe bilong yu.
Yumi ken skelim hau ol global tolerans standet i wok tru long ril wol.
Bilong wanem ol 'thickness tolerances' i save bagarapim ol 'procurement budgets'
Weathering ain(olsem A588 o Q355NH) i kamapim wanpela strongpela 50-100 μm ros leia we i lukautim sabstret. Dispela i larim yu long wokim ol bikpela haus na yu no ken penim ol. Dispela hap em i gutpela tru.
Hia em i trap. Ol i save putim prais bilong ain long hevi bilong en. Taim yu odarim wanpela 10mm tikpela plet, ol intanesenel standet i larim mil long rolim dispela plet i go liklik (negative tolerance) o liklik tik (positive tolerance).
Sapos yu wanbel long baim longhevi bilong tiori(ol i skelim olsem 10mm stret), tasol mil i save givim ol plet we ol i rolim long 9.5mm (em i stret long lo aninit long sampela standet), yu baim tasol ain we i no stap. Tasol, sapos aplikesen i nidim stretpela 'structural rigidity' na ol plet bilong yu i rol long 'extreme low end' bilong 'tolerance', ol enjinia bilong yu i ken feil long dispela samting.
Yu mas save stret long wanem kain standet yu baim samting.
Ol 'Global Tolerance Standards' i no stap
Tolerans stanol 'dards' bilong 'weathering steel sheets' i bihainim ol jenerel hot-rolled steel standet bilong ol spesifik rijon bilong ol. Dispela em i hau ol bikpela pilaia i bung wantaim.
| Standet (Rijen) | Aplikebol Standet | Tipikel Tiknes | Tolerans Klas / Rul |
Gutpela Samting Long Biling |
| Saina (GB) | GB/T 709 (Hot-Rolled) | 15 – 25 mm | Klas C: 0 i go long +1.6 mm |
Gutpela tasol. Yu kisim stret wanem samting yu baim, em i gutpela long 'theoretical weight billing'. |
| USA (ASTM) | ASTM A6 | 12.5 – 25 mm | Standet: -0.4 i go long +0.9 mm |
Larim 'negative tolerance'. I nidim gutpela kalkulesen bilong 'structural load'. |
| Yurop (EN) | EN 10029 | 8 – 15 mm | Klas D: ±0.7 mm |
Em i stret tru. Yu mas tok klia long 'Class leta' long PO. |
| Japan (JIS) | JIS G3193 | 16 – 25 mm | Klas A: ±0.4 mm |
Ol i bosim gut tru. Em i gutpela tru long ol bikpela kontena bilong salim ol samting (SPA-H). |
Ol standet bilong Saina (GB/T 709)
Sapos yukisim ol samting long ol bikpela mil bilong Saina olsem Baowu o Ansteel, ating yu lukluk long ol standet bilong GB. Long ol hot-plet (3-400 mm), ol enjinia i save makimKlas Col pasin bilong karim hevi. Chinese Class C em i gutpela tru long ol 'structural projects' bikos em i no save larim ol manmeri i no laikim ol narapela.
- 8-15 mm plet:Tolerans em 0 i go long +1.4 mm.
- 15-25 mm plet:Tolerans em 0 i go long +1.6 mm. Sapos yu baim Q345qNH bilong wokim bris, ol 'Chinese' mil bai mekim dispela wok long gutpela samtingsait. Yu kisim stret 'thickness' yu bin baim, o liklik moa.
American Standards (ASTM A6)
Baim ASTM A588 long US Steel o Nucor? Ol 'tolerance' i stap aninit long ASTM A6. I no olsem 'Chinese Class C', 'American standard' i larim tupela samting i kamap long ol samting we i no gutpela na i no gutpela.
- 12.5-25 mm plet:Swing we ol i ken larim em –0.4 mm i go long +0.9 mm.
- 25-50 mm plet:Swing i go bikpela long –0.5 mm i go long +1.1 mm. Sapos yu wok long disainim wanpela gutpela 'load-bearing structure', yu mas tingimlong dispela -0.4mm defisit long ol kalkulesen bilong yu.
European Standards (EN 10029)
Wet bilong Yurophering steel (olsem EN 10025-5 S355J2W) we ol i kisim long ol bikpela kampani olsem ArcelorMittal o SSAB i dipen long EN 10029 long ol 'dimensional tolerances'. Sistem bilong Yurop em i spesifik tru, na i gat 4-pela kain kain klas (A, B, C, na D).
- Klas Ai larim negatif tolerans (olsem, -0.5 i go long +0.9 mm long wanpela 8-15mm plet).
- Klas Ci fosim olgeta gutpela tolerans (0 i go long +1.4 mm).
- Klas Dem i wankain stret (±0.7 mm). Noken putim "EN 10029" long oda bilong yu long baim ol samting. Yu mas makim stret Klas leta, o'mill' bai i go long 'easiest rolling parameter'.
Japanese Standards (JIS G3193)
Nip bilong Japanpon Steel na JFE em ol gutpela mak bilong ol 'high-end weathering steel (espeseli SPA-H gred we ol i save yusim long ol kontena bilong salim ol samting). JIS G3193 Klas A i makim ol samting we i gat gutpela kontrol na i wankain.
- 16-25 mm plet:Stret ±0.4 mm.
- 25-40 mm plet:Stret ±0.5 mm.
3-pela lo bilong painim ol 'corten plet' na yu no ken kukim
Mi bin lukim tuplanti ol manmeri i save wokim ol kontena na ol infrastraksa kontrakta i save bungim hevi taim ol i kisim ol samting. Long lukautim saplai sen bilong yu, bihainimdispela tripela strongpela lo pastaim long yu salim wanpela diposit.
1. Skelim aut 'tolerance class'.
No kenaskim saplaia bilong yu long "A588 weathering steel." Askim ol long wanem mak ol i save rolim plet i go long en. Sapos yu wokim ol hap we i gat bikpela -stretpela samting,askim EN Klas B o Klas D. Long ol hevi infrastraksa, wanpela standet Saina Klas C em i gutpela tru.
2. Save long hau long skelim tru.
Taim olain i kamap long banis bilong yu, noken pasim wanpela 'caliper' long arere bilong plet. Planti taim ol arere i save bruk taim ol i katim o rolim. Ol intanesenel standet i tok olsem ol i mas skelim 'thickness'40 mm i go insait long arere. Kisim planti skelim longplet na skelim averes.
3. Toktok long ol tok bilong biling.
Sapos standard i larim ol bikpela 'negative tolerances', toktok long baim long 'actual scale weight' (antap long 'weighbridge') na i no long 'theoretical' kalkulesen. Sapos mil i strong long 'theoretical weight', askim long wanpela 'positive-only tolerance class'.
Weathering steel em i wanpela bikpela invesmen we i save katim tru longpela taim mentenens kos bilong yu. Tasol yu inap long kisim dispela sevings sapos yu baim gutpela samting long fran sait.
Sapos saplaia bilong yu nau i no tokaut klia long ol 'rolling tolerances' bilong ol, o sapos yu nidim ol 'plate' we ol i stretim gut long wanpela global infrastraksa projek, ol QA na enjiniaring tim bilong mipela long Promisteel i ken helpim yu long makim ol stretpela standet na garanti yu nidim.
