Keterangan
High-alloy austenitic stainless steel fitting
904L Tutup Ujung Pipa Stainless Steel
A copper- and molybdenum-alloyed stainless steel butt-weld closure for sulfuric-acid, pupuk, chemical and demanding process piping.
What is a 904L stainless steel pipe end cap?
A 904L stainless steel pipe end cap is a wrought butt-welding fitting used to terminate a pipe or header permanently. The rounded closed end, straight skirt and BE preparation provide a compact welded closure without a gasketed joint.
UNS N08904 is a high-nickel, molibdenum- and copper-alloyed austenitic stainless steel. It is commonly selected where 316L does not provide sufficient resistance to reducing acids or localized corrosion. Final selection must consider concentration, suhu, klorida, aerasi, crevices and cleaning chemistry.
904L pipe end cap specifications
| Produk | 904L butt weld pipe end cap / tutup BW |
|---|---|
| materi ASTM | ASTM A403/A403M WP904L; CR904L for applicable MSS SP-43 orders |
| Sebutan material | UNS N08904; EN 1.4539 / X1NiCrMoCu25-20-5 |
| Standar dimensi | ASME B16.9; MSS SP-43 when ordered and applicable |
| Ukuran nominalnya | NPS 1/2–48 / DN15–DN1200, subject to forming route and wall |
| Ketebalan dinding | sekolah 5S, 10S, 40S, 80S, 160, XXS dan dinding khusus proyek |
| Konstruksi | Seamless or welded according to ordered class and availability |
| Akhiri persiapan | Ujung bevel las pantat (MENJADI), matched to pipe wall and WPS |
| Kondisi / permukaan | Solution heat treated, descaled, pickled/passivated or project-specific finish |
| Dokumentasi | EN 10204 3.1 MTC, PMI dan laporan dimensi; NDE as ordered |
ASME B16.9 mencakup dimensi pas pengelasan butt tempa buatan pabrik, toleransi, peringkat, pengujian dan penandaan. Penerimaan material mengikuti spesifikasi ASTM yang dipesan. Ketersediaan di NPS 1/2–48 dan dinding berat tunduk pada paduan, ukuran, kuantitas dan rute produksi.
ASME B16.9 dan opsi pasokan MSS SP-43
ASME B16.9
Use for full-pressure factory-made wrought butt-welding fitting dimensions. State NPS, exact schedule/wall, kelas konstruksi, bevel and material grade.
MSS SP-43
Use for lower-pressure, corrosion-resistant butt-welding fitting dimensions when the piping specification permits. Thin-wall schedule matching and dimensional basis must be stated.
904L vs 316L pipe end cap
| Titik seleksi | 904L / N08904 | 316L / S31603 |
|---|---|---|
| Alloying | Nikel tinggi, about 4–5% Mo and copper addition | Lower nickel and about 2–3% Mo |
| Keuntungan khas | Improved resistance in selected reducing-acid and localized-corrosion service | Broad economical corrosion resistance and fabrication familiarity |
| Typical use | Sulfuric/phosphoric acid, fertilizer and severe process duty | Makanan, air, pharmaceutical and moderate chemical service |
| Procurement | Higher alloy cost; PMI strongly recommended | More widely stocked and economical |
Aplikasi yang umum
| Industri | Layanan khas | Alasan pemilihan |
|---|---|---|
| Pemrosesan kimia | Acid transfer, reaktor, scrubbers and process headers | High-alloy resistance to selected aggressive media |
| Produksi pupuk | Phosphoric and sulfuric acid process systems | Tembaga- and molybdenum-bearing alloy chemistry |
| Pulp dan kertas | Bleaching and chemical recovery support lines | Resistance in selected chloride and acidic environments |
| Pengendalian polusi | FGD and wet scrubber auxiliary piping | Improved localized-corrosion margin over 316L |
Contoh penerapan bukan merupakan persetujuan desain. Insinyur material perpipaan harus memastikan kompatibilitas korosi, suhu, tekanan, prosedur pengelasan dan persyaratan kode yang berlaku.
Manufaktur, inspeksi dan EN 10204 dokumentasi
904L caps require verified raw material, controlled forming, solution heat treatment and appropriate cleaning. PMI is recommended because visual appearance cannot distinguish 904L reliably from common stainless grades.
Sertifikat material dan ketertelusuran nomor panas disesuaikan dengan kualitas yang dipesan.
PMI memverifikasi elemen paduan utama ketika ditentukan dalam rencana inspeksi.
Diameter luar, panjang keseluruhan, ketebalan dinding, ovalitas dan geometri BE diperiksa.
PT, UT, RT, kondisi permukaan atau kesaksian pihak ketiga diatur berdasarkan pesanan.
Daftar periksa RFQ
- Nilai ASTM dan nomor UNS
- ASME B16.9 atau edisi MSS SP-43
- Ukuran NPS atau DN
- Jadwal atau ketebalan dinding yang tepat
- Konstruksi/kelas mulus atau dilas
- JADILAH detail bevel dan pipa yang serasi
- Jumlah dan tujuan pengiriman
- EN 10204 3.1, PMI, persyaratan dimensi dan NDE
Pertanyaan yang sering diajukan
What ASTM grade is used for a 904L pipe cap?
ASTM A403/A403M WP904L is the wrought pressure-fitting grade for UNS N08904. CR904L may be specified for fittings made to an applicable MSS SP-43 dimensional basis.
What is the EN equivalent of 904L?
Sebutan Eropa yang umum dirujuk adalah EN 1.4539, X1NiCrMoCu25-20-5. The purchase order should state the governing material standard rather than treating designations as automatically interchangeable.
Why choose 904L instead of 316L?
904L contains more nickel and molybdenum plus copper, improving performance in selected reducing acids and localized-corrosion environments. A service-specific corrosion review is still required.
Are Sch 160 and XXS caps always available?
Availability depends on NPS, exact wall, heat-treatment route and quantity. Heavy-wall requirements should be confirmed from matching pipe dimensions before quotation.
Which inspection documents can be supplied?
EN 10204 3.1 MTC, ketertelusuran panas, PMI dan inspeksi dimensi adalah hal biasa. PT, UT, RT and third-party inspection can be added when ordered.
Request a 904L pipe end cap quotation
Kirim nilai ASTM, NPC/DN, jadwal, konstruksi, memiringkan, quantity and inspection requirements for a project-specific offer.
