What are the alloy materials?
(1) Mixed material alloy (* * * molten mixture), which is formed by the crystallization of each component of the alloy if the liquid alloy is condensed, such as solder, bismuth cadmium alloy, etc.
(2) solid melting alloys, which produce ionic crystals when liquid alloys are condensed, such as gold and silver alloys;
(3) Intermetallic alloys, which are alloys in which each component produces chemical substances with each other, such as copper (β-brass, γ-copper and ε-brass) composed of copper and zinc.
All kinds of alloys have the following * * * properties:
(1) The melting point of most alloys is less than the melting point of any of their components;
(2) the strength is generally greater than that of any metal material in its composition; (Necessary and sufficient conditions: the sodium-potassium alloy is liquid and used as a heat transfer agent in the atomic reactor)
(3) The electrical conductivity and heat transfer of the alloy are less than those of any metal material. Using this characteristic of alloy, raw materials with high resistance and high heat transfer coefficient can be manufactured. It can also manufacture raw materials with unique characteristics.
(4) For some stainless steel plates with strong corrosion resistance, such as adding 15% chromium and 9% nickel to iron to obtain a corrosion-resistant stainless steel plate, what are the types of alloy processing suitable for chemical industry?
Nodular cast iron, alloy steel, stainless steel plate, copper, brass, white copper, solder, hard aluminum, 18K and 18K platinum.
alloy production and processing
1 low carbon steel: the representative steel grades are 3, 35, 4 and 45, and also ML3, ML35, ML4 and ML45, which have relatively stable indoor temperature characteristics and are used for small and medium-sized parts, standard parts, rotating shafts and transmission gears [2].
2 alloy steel: representing steel grades 4Mn2 and 5Mn2. It has over-temperature sensitivity, continuous high-temperature tempering brittleness, easy cracking after water quenching, and higher cutting performance than carbon steel.
3 silicon alloy steel: representing steel grades 35SiMn and 42SiMn. High fatigue limit, carburizing and overtemperature sensitivity and temper brittleness. It can be used to manufacture transmission gears, shafts, transmission shafts, crankshafts, scroll bars, etc. with medium speed and high load but little impact, and can also manufacture standard parts below 4℃.
4 boron steel: representing steel grades 4B, 45B, 5BA and ML35B. High cutting performance and comprehensive physical properties are higher than those of carbon steel, and 4Cr is very used to manufacture parts and standard parts with small cross-sectional specifications.
5 Mn-B steel: representing the steel grade 4MnB. Cutting performance slightly higher than 4Cr, high compressive strength, ductility and ultra-low temperature fracture toughness, temper brittleness. 4MnB is commonly used to manufacture large cross-section parts instead of 4Cr and small items instead of 4CrNi. 45MnB replaces 4Cr and 45Cr; 45Mn2B replaces 45Cr and partially replaces 4CrNi and 45CrNi as the key shaft, and there is also ML35MnB for the production and manufacture of standard parts.
6 Mn-V-B steel: representing steel grades 2MnVB, 4MnVB,. The aging treatment characteristics and cutting performance are better than 4Cr, the overtemperature tendency is small, and it has temper brittleness. It is commonly used to replace 4Cr, 45Cr, 38CrSi, 42CrMo and 4CrNi to manufacture key aging treatment parts, and it is also effective for small and medium-sized anchor bolts below grade 1.9, ML2MnVB.
7 Mn-W-B steel: the representative steel grade is 4MnWB. Excellent ultra-low temperature impact characteristics, no temper brittleness. Very similar to 35CrMo and 4CrNi, used to manufacture parts within 7 mm.
8 Si-Mn alloy Mo-W steel material: representing steel grade 35SiMn2MoW. It has high cutting performance, calculated by 5% austenite, with water quenching aperture of 18 and oil quenching diameter of 1; The tendency of quenching and tempering brittleness is small; With high toughness and high wear resistance. It can replace 35CrNiMoA and 4CrNiMo to manufacture shafts, crankshafts and anchor bolts with large cross section and heavy load.
9 Si-Mn alloy Mo-W-V steel: the representative steel grade is 37SiMn2MoWVA. Water quenching aperture 1, oil quenching diameter 7; Excellent tempering reliability, ultra-low temperature fracture toughness, higher high temperature compressive strength and less tempering brittleness, which is used to manufacture shaft parts with large cross section.
1 manganese steel: represented by 4Cr alloy seamless steel pipe and ML4Cr. Good cutting performance, water quenching 28-6mm, oil quenching 15-4 mm. High physical properties, excellent ultra-low temperature fracture toughness, low vacancy sensitivity and temper brittleness. Used to manufacture shafts, crankshafts, transmission gears and anchor bolts.