Duplex chuma cha pua

According to the characteristics of the two-phase structure, by properly controlling the chemical composition and heat treatment process, the excellent toughness and weldability of austenitic stainless steel are combined with the higher strength and chloride stress corrosion resistance of ferritic stainless steel, making duplex stainless Chuma aina ya chuma ambayo inachanganya upinzani bora wa kutu, nguvu ya juu na usindikaji rahisi na utengenezaji. Their physical properties are between austenitic stainless steel and ferritic stainless steel, but closer to ferritic stainless steel and carbon steel. The resistance to chloride pitting and crevice corrosion of duplex stainless steel is related to the content of chromium, molybdenum and nitrogen. Its resistance to pitting and crevice corrosion can be similar to that of 316 stainless steel, or higher than that of stainless steel for seawater, such as 6%MO austenitic stainless steel. All duplex stainless steels are significantly more resistant to chloride stress corrosion cracking than 300 series austenitic stainless steels, and their strength is also much higher than austenitic stainless steels, while showing good plasticity and toughness.

Aina anuwai za bidhaa za chuma cha pua: sahani na bomba -bomba -bomba zilizo na bomba na bomba la misaada ya bomba la msamaha na viboko vya flanges na waya

Chuma cha pua cha Duplex kwa ujumla kinaweza kugawanywa katika vikundi vinne:

Mbili: Aina ya Aloi ya Kati, Daraja la Mwakilishi UNSS31803, Pren: 32-33, upinzani wa kutu ni kati ya AISI316L na 6%Mo+N austenitic chuma cha pua.

Tatu: Aina ya juu ya alloy, kwa ujumla iliyo na 25% Cr, pia ina molybdenum na nitrojeni, zingine pia zina shaba na tungsten, darasa za kawaida hazinaS32550, Pren: 38-39, upinzani wa kutu ni juu kuliko 22% CR duplex chuma cha pua.

Four: Super duplex stainless steel type, containing high molybdenum and nitrogen, standard grades are UNSS32750, some also contain tungsten and copper, PREN>40, can be used in harsh medium conditions, with good corrosion resistance and mechanical comprehensive properties, comparable to super Chuma cha pua. (Kumbuka: Pren: Pitting Resistance Thamani sawa)

Chemical composition The main alloying elements of duplex steel are Cr, Ni, Mo and N. Among them, Cr and Mo are used to increase the ferrite content, while Ni and N are austenite stabilizing elements. Daraja zingine za chuma pia zina vitu kama MN, Cu, na W. Cr, Ni, na MO vinaweza kuboresha upinzani wa kutu. Upinzani wake kwa kutu na kutu ni nzuri sana katika mazingira yenye kloridi.

Manufaa ya chuma cha pua

1. Ikilinganishwa na chuma cha pua

1) Tabia kamili ya mitambo ni kubwa kuliko ile ya chuma cha pua, haswa ugumu wa plastiki. Sio nyeti kwa brittleness kama chuma cha pua.

2) Isipokuwa kwa upinzani wa kutu wa kutu, upinzani mwingine wa kutu wa eneo ni bora kuliko chuma cha pua.

3) Utendaji wa usindikaji baridi na utendaji wa kutengeneza baridi ni bora zaidi kuliko chuma cha pua.

4) Utendaji wa kulehemu ni bora zaidi kuliko chuma cha pua. Kwa ujumla, hakuna preheating inahitajika kabla ya kulehemu na hakuna matibabu ya joto inahitajika baada ya kulehemu.

5) Aina ya maombi ni pana kuliko ile ya chuma cha pua.

Maombi

Kwa sababu ya nguvu ya juu ya chuma duplex, mara nyingi inaweza kuokoa vifaa, kama vile kupunguza unene wa ukuta wa bomba. Chukua SAF2205 na SAF2507W kama mifano. SAF2205 inafaa kutumika katika mazingira yenye klorini. Nyenzo hii inafaa kwa kusafisha mafuta au media nyingine ya mchakato iliyochanganywa na kloridi. SAF2205 inafaa sana kwa kubadilishana joto ambayo hutumia suluhisho zenye maji ya klorini au maji yenye chumvi kidogo kama media ya baridi. Nyenzo hii pia inafaa kwa suluhisho la asidi ya sulfuri na asidi safi ya kikaboni na mchanganyiko wao. For example: oil pipes in the oil and gas industry: crude oil desalination in refineries, sulfur-containing gas purification, wastewater treatment equipment; Mifumo ya baridi inayotumia maji yenye chumvi kidogo au suluhisho zenye klorini.