Optional materials for petrochemical transfer pumps using nitric acid/sulfuric acid/hydrochloric acid/phosphoric acid/hydrofluoric acid/caustic soda/soda ash

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Possible materials for petrochemical transfer pumps used for nitric acid/sulfuric acid/hydrochloric acid/phosphoric acid/hydrofluoric acid/caustic soda/soda ash: Nitric acid (HNO3). General characteristics: It is an oxidizing medium. The operating temperature for concentrated HNO3 is generally below 40°C. Elements Cr and Si provide oxidation resistance, and stainless steels as well as other materials containing Cr and Si are ideal materials for resisting corrosion in concentrated HNO3. 7 h7 u, W9 R) {; d0 J; l Therefore, the material commonly chosen for nitric acid transfer pumps is: 0 s* |/ z) k( O4 z: X( x High-silicon cast iron (STSi15R): all temperatures below 93% ； High-chromium cast iron (Cr28): All temperatures below 80% ； 1 u. H9 u. k9 j2 {7 r0 m9 v8 R Stainless steel (SUS304, SUS316, SUS316L): all temperatures below 80% ； Steel (0Cr13Ni7Si4): All temperatures below 98% ； Industrial pure titanium (TA1, TA2): all temperatures below the boiling point (except at smoking points) ； Industrial pure aluminum (Al): All temperatures at room temperature (only for containers) ； CD-4MCu age-hardening alloy: all temperatures below the boiling point ； Materials such as Hastelloy C, gold, and tantalum all possess excellent corrosion resistance. 　Sulfuric acid (H2SO4) “ `! ~! Z3 D: y! X$ S3 W9 U General characteristics: The boiling point increases as the concentration rises. For example: a concentration of 5% results in a boiling point of 101 ℃ ； With a concentration of 50%, its boiling point is 124℃ ； The concentration is 98%, and its boiling point is 332°C. Concentrations below 75% are reducing (or neutral), while those above 75% are oxidizing. Therefore, the materials commonly chosen for sulfuric acid transfer pumps are: stainless steel (SUS316, SUS316L): for temperatures below 40 ℃ and concentrations of around 20% ； 9 j1 {1 F' ~" N1 w( @* z6 w Steel 904 (SUS904, SUS904L): suitable for temperatures of 40–60 °C and concentrations of 20–75% ； Temperature 80 ℃, concentration below 60% ； ( J+ b# f- q$ _2 D' K& Q2 t High-silicon cast iron (STSi15R): various concentrations from room temperature to 90 ℃ ； Pure lead, hard lead: various temperatures at room temperature ； Steel (0Cr13Ni7Si4): Concentrated sulfuric acid at temperatures below 90 °C, and high-temperature concentrated sulfuric acid (120–150 °C) ； Ordinary carbon steel: concentrated sulfuric acid at over 70% at room temperature ； , P" L3 H2 n9 l Cast iron: concentrated sulfuric acid at room temperature ； . P1 X$ g, L' `' X5 Q5 z/ O) @ Monel, nickel metal, Inconel: sulfuric acid at moderate temperature and concentration ； % Titanium-molybdenum alloy (Ti-32Mo): below the boiling point in 60% sulfuric acid, and below 50 °C in 98% sulfuric acid ； Hastelloy B, D: below 100 ℃, 75% sulfuric acid ； Hastelloy C: Various temperatures around 100 ℃ ； ! `' Q; l9 x% N Nickel cast iron (STNiCr202): 60–90% sulfuric acid at room temperature. 　General properties of hydrochloric acid (HCl): It is a reducing medium, with a maximum temperature of 36–37%. Boiling point: At a concentration of 20%, it is 110 ℃ ； At a concentration of 20”36%, it is 50℃ ； Therefore, the maximum temperature for hydrochloric acid is 50 ℃. Therefore, the material commonly chosen for hydrochloric acid transfer pumps is: * j2 Q6 {$ e: Y4 ^ K Tantalum (Ta): It is the most ideal corrosion-resistant material for hydrochloric acid, but it is expensive and is often used in metering devices where precision is required ； Hastelloy B: hydrochloric acid at a temperature of ≤ 50 ℃ and a concentration of 36% ； Titanium-molybdenum alloy (Ti-32Mo): all temperatures and all concentrations ； ! s8 h* Nickel-molybdenum alloy (Chlorimetz, 0Ni62Mo32Fe3): at all temperatures and concentrations ； & Y3 n$ n8 }0 V0 ~+ t% S( F Industrial pure titanium (TA1, TA2): hydrochloric acid at 10% or less at room temperature ； + w! b/ h3 |, \# h& k7 { ZXSNM(L) alloy (00Ni70Mo28Fe2): hydrochloric acid at 50 ℃ and 36% concentration ；