Pendahuluan
EPC surya yang menulis galvanized steel, 25-year life pada RFQ tracker akan menerima tiga tawaran yang tidak bisa dibandingkan. Satu mill menawar koil kontinyu EN 10346 ZM untuk purlin C. Satu bengkel menawar ISO 1461 setelah fabrikasi pada tiang las. Pihak ketiga mengganti DX51D+Z karena kata galvanized muncul. Yield bisa cocok gambar. Kimia coating tidak.
Ini panduan jalur tugas untuk importir yang membeli baja tracker dari China: profil roll-formed dari koil, dan tiang atau braket las yang masih butuh lapisan seng setelah pemotongan. Bukan pengganti edisi yang dipesan dari EN 10346, ISO 1461, ASTM A123, ASTM A1046, JIS G 3323, atau ISO 9223. ZAM, Magnelis, PosMAC, dan SuperDyma adalah coating mill, bukan grade yang bisa ditukar. Bekukan standar, designation, dan bentuk produk sebelum membandingkan angka FOB.
Klasifikasikan lokasi sebelum menamai coating
Klasifikasikan dulu lokasi surya menurut ISO 9223, lalu pecah bill of materials. Purlin roll-formed biasanya masuk koil EN 10346 ZM. Tiang las dan braket tebal biasanya masuk ISO 1461 atau ASTM A123 HDG setelah fabrikasi. ZM120 bukan pengganti 85 um post-galvanizing.
ISO 9223 / ISO 12944-2 is the duty. The mill already has zinc-coated coil. Batch HDG is an extra shop after welding. If the RFQ only writes GI or HDG, the cheapest photographable path wins.
| Kelas lokasi | Setting tracker tipikal | Jalur koil | Jalur seksi fabrikasi |
|---|---|---|---|
| C2–C3 | Inland, low chloride | EN 10346 ZM on structural coil, often ZM120–ZM275 | ISO 1461 or ASTM A123 after fabrication if the part is welded |
| C4 | Industrial belt or coast beyond about 1 km | Raise ZM mass; ZM275–ZM310 is a common RFQ band | Mean coating thickness on the finished thickness, not a coil Z code |
| C5 | Severe coastal, about 150 m class talk | ZM alone is often not a 25-year standalone story | Batch HDG after all cutting and welding, with sealed edges if coil is still used |
Manufacturer design-life tables for one Type 2 Zn-Al-Mg coating (ZM310 / ZM430) are often quoted as C3 30 to >50 years, C4 15-30 years, and C5 8-15 years for ZM310. Those bands are mill data. They are not a generic ZM guarantee and they exclude soil or standing-water contact. A USD 40 per tonne gap on 2.5 mm purlin coil is often this missing class. ZM120 coil is not comparable with 85 um batch HDG on 8 mm pile.
Pisahkan baja tracker menurut bentuk: koil roll-formed versus seksi fabrikasi
Product form decides the process. Continuous coating happens on strip before the profiler. Batch HDG happens on the finished part after cutting, punching, and welding.
| Anggota tracker | Bentuk biasa | Coating yang sesuai | Mengapa tukar gagal |
|---|---|---|---|
| C-purlin, U-channel, cold-formed girder | Coil, typically 1.5–3.2 mm | EN 10346 +ZM on a structural grade | Batch HDG after roll-forming is slow, distorts thin gauge, and is the wrong shop |
| Torque tube from strip | Coil or tube from coated strip | ZM coil if the weld is re-protected; HDG if the tube is welded from black steel | A black weld on ZM coil is a bare cut until it is repaired |
| Driven pile, H-pile, thick bracket, shop-welded frame | Plate or section, often ≥6 mm | ISO 1461 or ASTM A123 after fabrication | ZM coil cannot wrap a shop weld; cut edges on thick plate are not a 2 mm self-heal story |
Koil galvanis DX51D adalah produk seng kontinyu grade forming. Purlin yang butuh kelas yield harus membekukan S350GD atau S550GD, bukan julukan DX51D. Koil galvanis G550 adalah seng kekuatan tinggi untuk atap; kimia tetap +Z kecuali PO menulis +ZM. SGCH adalah koil keras, bukan grade struktural tracker. Balok H galvanis adalah jalur seksi fabrikasi. Baja datar karbon adalah pelat hitam yang kemudian masuk kettle HDG. Jangan campur baris itu dalam satu sel GI tracker.
Kapan koil EN 10346 ZM cocok untuk tugas itu
ZM / Zn-Al-Mg is a continuous coating. EN 10346 writes it as ZM mass in g/m2 both sides. ASTM A1046 covers Zn-Al-Mg sheet and names types. JIS G 3323 is the Japanese sheet standard. No document makes two mill baths 100% equivalent.
| Coating family | Standard buyers name | Chemistry on mill sheets | Number that must be printed |
|---|---|---|---|
| Zn-Al-Mg coil | EN 10346 +ZM; ASTM A1046; JIS G 3323 | Zinc with aluminium and magnesium. One Type 2 bath is often described as about 3.5% Al and 3% Mg. Other baths run higher aluminium. | ZM120, ZM275, ZM310, ZM430 as total both-sides mass |
| Continuous zinc coil | EN 10346 +Z; ASTM A653 | Essentially zinc | Z275 as total both-sides mass |
| Batch HDG | ISO 1461; ASTM A123 | Zinc bath, typically high-purity zinc | Mean and local-minimum thickness in μm on the finished part |
Coating density is mill-specific. One Type 2 producer publishes 6.2 g/cm3 and lists ZM120 about 10 um per side, ZM310 about 25 um, ZM430 about 35 um. Other catalogues use about 6.0 g/cm3. Do not convert a competitor ZM310 with zinc density 7.1 g/cm3 and call it equal to 85 um batch HDG. Substrate chemistry is a separate table. Confirm the ordered EN 10346 edition; typical maxima, not the heat on your dock:
| Grade | C % max | Si % max | Mn % max | P % max | S % max | Yield min (MPa) | Tensile min (MPa) | A80 typical table |
|---|---|---|---|---|---|---|---|---|
| S350GD | 0.20 | 0.60 | 1.70 | 0.10 | 0.045 | 350 | 420 | 16 |
| S550GD | 0.20 | 0.60 | 1.70 | 0.10 | 0.045 | 550 | 560 | 12 |
| DX51D | 0.18 | 0.50 | 1.20 | 0.12 | 0.045 | — (forming grade) | 270–500 band commonly discussed | 22 |
S350GD and S550GD are structural coating grades. DX51D is not a yield class. Shipping DX51D+Z against S350GD+ZM310 changes chemistry and the mechanical contract. Cut-edge talk on thin strip: Al and Mg help a dense film over a sheared edge. One German Type 2 approval uses ZM120 or higher up to 1.5 mm, ZM250 or higher up to 3.0 mm, ZM310 or higher above 3.0 mm. ZM coil fits roll-formed 1.5-3.2 mm members, mill edge rules, class plus mass together, and named weld re-protection, not hope that self-heal covers a 6 mm weld.
Kapan HDG setelah fabrikasi lebih aman
Batch HDG coats the part you install. Cutting, drilling, and welding happen on black steel. Thick piles and shop-welded frames still go to ISO 1461 or ASTM A123 even when purlins are ZM coil. Common ISO 1461 minima for articles not centrifuged (confirm edition):
| Steel thickness t | Local min (um) | Mean (um) |
|---|---|---|
| t ≥ 6 mm | 70 | 85 |
| 3 mm ≤ t < 6 mm | 55 | 70 |
| 1.5 mm ≤ t < 3 mm | 45 | 55 |
| t < 1.5 mm | 35 | 45 |
ASTM A123 uses coating grades by steel thickness and often lands thicker on heavy sections than the ISO 1461 mean. Do not treat 85 um and ASTM A123 as the same cell. Fabricated HDG substrate is usually carbon plate or section, not S350GD coil. Buyers still discuss S355JR / Q355B / A36 families for piles. Typical thinner-plate S355JR talk: C 0.24% max, Mn 1.60% max, P and S 0.035% max, yield 355 MPa at t <= 16 mm. Batch HDG belongs when the member is shop-welded, thicker than purlin coil, C5 with an insurance file, or in soil. Do not send 2.0 mm C-purlins to the kettle. Do not send 12 mm welded piles as ZM coil.
Massa coating, grade substrat, dan tepi potong yang menggugurkan tawaran
These are disqualifiers, not preferences.
| Field kosong | Apa yang dikirim mill | Aturan hold |
|---|---|---|
| Site class | C3 coil against a C5 drawing | No award until ISO 9223 / ISO 12944 class is on the PO |
| Product form | One GI price for purlins and piles | Split the bill: coil ZM vs batch HDG |
| Coating designation | Z275 against a ZM310 line, or ZM120 against 85 μm | Coating family and number must match the member |
| Substrate grade | DX51D or SGCH against S350GD / S550GD | Mechanical class must be printed |
| Thickness and tolerance | ”2.5 mm GI” | Thickness, EN 10143 class or mill tolerance, width, coil ID |
| Cut-edge / perforation rule | Dense punching on 3 mm ZM120 | Mass vs thickness rule from the named mill, or switch that part to HDG |
| Fasteners | Standard HDG bolts on a C5 tracker | Fastener coating is its own line; C5 often needs zinc flake or A4-316L with isolation |
| Weld repair on coated tube | Bare HAZ | Named re-protection thickness |
Dimensional band actually shipped for tracker coil, mill confirmation required: thickness 1.5-3.2 mm for purlins; width as developed profile, often 200-600 mm slit from 1000-1250 mm parent coil; ID 508 mm or 610 mm; slit coil weight 3-8 MT. Name EN 10143 class or a mill mm band. +/-0.05 mm is a commercial extra. ZM passivation is chromate-free film or oil. Temporary storage, not the 25-year layer. Write dry / oiled / chemical passivation.
Apa yang harus dibuktikan MTC dan PSI sebelum kontainer berangkat
The first warning is a PI that wrote GI tracker steel, 2.5 mm. Floor pattern: PI writes galvanized, 2.5 x 250, S350, 25-year. Coil tag is DX51D+Z275. Pile pack is still black H-beam. PSI photographs spangle. Missing ZM mass and ISO 1461 mean thickness never enter the report. Check praktik dokumentasi EN 10204 3.1 before booking a profiler or kettle. ZM is not +Z. +Z is not ISO 1461. ISO 1461 is not ASTM A123. Coil: g/m2 both sides as ZMxxx. Fabricated: um mean and local min. S350GD is not DX51D. S355JR plate is not S350GD coil. Heat number on tag, packing list, and EN 10204 3.1 MTC. Coil packing: VCI paper, film, metal edge rings, at least 3 circumferential and 4 radial straps. Eye-to-sky or eye-to-wall. A 20GP still lands near 25-28 MT. Tell SGS, BV, or TUV to photograph tags and thickness spots. If the mill says ZM120, Z275, and 85 um HDG are equivalent because all three are zinc, ask for standard, mass or mean thickness, and product form on the same page as yield. Keep these contract numbers on the same page as yield: EN 10346, EN 10143, EN 10204 3.1, ISO 1461, ISO 9223, ISO 12944-2, ASTM A123, ASTM A1046, ASTM A653, JIS G 3323, ZM120 ZM275 ZM310 ZM430 Z275, density 6.2 g/cm3 or 6.0 g/cm3 not 7.1 g/cm3 zinc, about 10 um / 25 um / 35 um per side on one Type 2 mill, ISO 1461 70/85 um at t >= 6 mm, 1.5-3.2 mm purlins, 2.0 mm C-purlin distortion, 2.5 x 250 tag, 8 mm pile, 12 mm welded pile, 16 mm yield basis, slit 200-600 mm from 1000-1250 mm parent, ID 508 mm or 610 mm, 3-8 MT slit coils, 25-28 MT per 20GP, 7-15 days, S350GD 0.20/0.60/1.70/0.10/0.045/350/420/16, S550GD 550/560/12, DX51D 0.18/0.50/1.20/0.12/270-500/22, S355JR talk C 0.24 Mn 1.60 P/S 0.035 yield 355 MPa, +/-0.05 mm extra, 3.5% Al, 150 m C5 talk, 25-year sentence, not 100% equivalent, A36 family, A4-316L fasteners, WhatsApp +86 151 5311 2221.
Baris RFQ yang memisahkan koil ZM dari HDG batch
Copy after the bill of materials. Fasteners, pile soil, and earthing stay separate lines.
Roll-formed members (coil)
- Standard: EN 10346 (ordered edition) +ZM, or ASTM A1046 type named, or JIS G 3323.
- Grade: S350GD or S550GD. Not DX51D unless commercial quality is truly the duty.
- Coating: ZM310 (example). Both sides. Actual mass on the MTC.
- Thickness x width; EN 10143; ID 508 or 610 mm.
- Surface: chromate-free passivation or oil.
- Mill edge rule for punched holes.
- Certificate: EN 10204 3.1 with heat, chemistry, yield/tensile/elongation, coating mass, designation.
- Packing: VCI + film + rings + 3 circumferential / 4 radial.
Fabricated members (batch HDG)
- Black steel: S355JR / specified plate or section; size; named WPS.
- Galvanizing: ISO 1461 or ASTM A123, ordered edition. Mean and local min for actual thickness.
- Kettle after all cutting, drilling, welding.
- Certificate: EN 10204 3.1 plus galvanizer thickness spots.
- Packing: bundle separators, no wet stacking.
Coil trial MOQ remains 1 x 20GP (25-28 MT) on standard slit sizes.
Kesimpulan
ZM coil and batch HDG are two answers to two tracker jobs. Classify the site, split the bill, freeze the standard and the number, then read that number on the MTC. A 25-year sentence without class, form, and coating designation is not a specification.
Merencanakan pesanan atau butuh verifikasi teknis?
Jika Anda mengadakan koil struktural coating ZM atau seksi tracker HDG batch dan perlu mencocokkan baris coating dengan daftar material:
- Penawaran teknis cepat: Pesanan uji dari 1 x 20GP (25-28 MT) dengan dispatch 7-15 hari untuk ukuran koil standar. Kirim designation (ZM atau ISO 1461 / ASTM A123), grade, tebal, dan kuantitas lewat formulir RFQ daring.
- Jaminan mutu: Setiap order dilengkapi EN 10204 3.1 Mill Test Certificates asli dengan ketertelusuran heat. Inspeksi SGS, BV, TUV diterima.
- Inquiry mendesak: Meja ekspor Shandong di WhatsApp +86 151 5311 2221.
