Stainless stee
Stainless stee
Stainless stee304 stainless steel plate 8mm,
(II) The price of steel has been running at a low level. From January 31 to June 2012, the overall performance of the domestic steel market was depressed. With the substantial release of crude steel production capacity, the market supply and demand fell into an imbalance, and the steel price entered a downward channel, which has been weak for more than four months. As of June 26, the steel price index had dropped to 100.48 points, foreign countries have frequently carried out & ldquo; Double inverse & rdquo; This has a great impact on China's stainless steel casting industry. Export is a large part of the development of China's stainless steel industry and occupies a huge market share in its industrial development. In the face of the current economic downturn and slow development speed the development of China's stainless steel industry should continuously improve product quality, combine products with environmental protection Better develop overseas trade and deal with trade protectionism, energy resources and cultural environment, and improve the competitiveness of stainless steel products. Only in this way can we achieve an invincible position in foreign trade.
.The slab solidified on the surface continues to be rapidly cooled through the secondary cooling section until the core becomes solid, and the whole continuous casting process of stainless steel pipe fittings is completed.
Prepare materials and tools, prepare corresponding materials and tools, and check whether they match and apply.
.Cold rolled steel strip shall be delivered in the state of heat treatment (annealing, normalizing and tempering after normalizing), and shall be delivered smoothly.
·Pulp and paper industry classifier, bleaching equipment, storage and treatment system.
Cold rolled oriented silicon steel strip (sheet) represents: 100 times of DQ + iron loss value (at the frequency of 50Hz, the waveform is sinusoidal, and the magnetic induction peak value is the unit weight iron loss value of 7T) + 100 times of thickness value. Sometimes,304 stainless steel pipe, G is added after the iron loss value to represent high magnetic induction. For example, dq133 represents cold rolled oriented silicon steel strip (sheet) with iron loss value of 3 and thickness of 0.3mm. Now the new model is 30q133.
The best choice is also frequently launched in the market. If you want to buy a stainless steel water supply pipe with quality assurance, how should you choose?
Combined steel and spring steel such as 20CrMnTi 60simn, (C content is expressed in ten thousandths).
Theoretical weight of stainless steel pipe: w = outer diameter - wall thickness x wall thickness x0.02491.
Quality inspection report.Both ends of the steel pipe shall be cut into right angles and burrs shall be removed.
The steel strip can be delivered without heat treatment under the condition that all properties meet the standard requirements. Ordinary drawing grade steel strip is allowed to be delivered without heat treatment.
Stainless steel pipe national standard thickness in the stainless steel pipe industry, the steel that meets the national standard is generally called & ldquo; National Standard & rdquo; Inferior steel that does not meet national standards is called & ldquo; Winning the bid& ldquo; Non standard & rdquo; In practical application,Of stainless steel plate 201, the quality of national standard and non-standard is similar, mainly due to the difference in thickness. A thickness of national standard is actually 1mm, but a thickness of non-standard is actually only 0.8mm or other thickness less than 1mm. Non-standard is basically equivalent to winning the bid. Standard index size (323mm) label number standard implementation standard gbt14976-2012 non-standard specific thickness ratio outer diameter steel pipes are produced according to the standard. 2 non-standard belongs to customized difference. Wood office says ha ha customized on demand. 3 thickness area: the difference between standard, thickened, stainless steel American Standard and national standard mainly lies in C content and P content; The C content and P content of Chinese standards are lower than those of American Standard ASTM A312@_@ The two important elements of material are chromium and nickel, 15 9 large plants and 18 8 large plants of national standard and 18 8 small plants of American Standard 132@_ @ The national standard contains more than 17 chromium and the American Standard contains more than 18 chromium@_@ Stainless steel pipe is an American Standard, not in the national standard. The corresponding national standard is 06cr19ni10.
3: stainless steel rod: round rod, square steel, flat steel, hexagonal angle steel, round steel, solid rod. Hexagonal rod and square steel (flat steel) are more expensive than round rod (most of the hexagonal rod specifications are imported high-quality materials). The bright surface is more expensive than black leather surface. Large diameter bars are mostly black leather rods. 303 is a unique material in bars, which belongs to easy turning (cutting) materials, It is mainly used for self cutting. In addition, 304f.303cu.316f also belong to easy cutting materials
The cost is reasonable.There are about 45 types of hot rolled (hot) stainless steel pipes with a diameter of 54-480mm and 36 types with a wall thickness of 5-45mm. There are 65 types of cold drawn (rolled) stainless steel pipes with a diameter of 6-200mm and 39 types with a wall thickness of 0.5-21mm.
Solution treatment. The main purpose of water quenching after heating the steel to 1050 ~ 1150 ℃ is to dissolve the carbide in austenite and keep this state to room temperature, so that the corrosion resistance of the steel will be greatly improved. As mentioned above, in order to prevent intergranular corrosion, solid solution treatment is usually used to dissolve Cr23C6 in austenite and then cool rapidly. Air cooling can be adopted for parts, and water cooling is generally adopted.
The dual phase microstructure of stress corrosion resistant stainless steel is helpful to improve the stress corrosion cracking resistance of stainless steel. In the presence of certain temperature, stress, oxygen and chloride, chloride stress corrosion will occur in austenitic stainless steel. Since these conditions are not easy, the use of L and 317L is limited in this regard.
.Its plastic toughness is lower than that of austenitic stainless steel, and its cold and hot working process and formability are not as good as that of austenitic stainless steel.
≥520EL（%）
Stainless steel pipes are not easy to rust as long as they are not in particularly polluted places. 201 stainless steel is easy to rust. These two can be tested with magnet. They are not magnetic and can not be absorbed by magnet.