TORICH INTERNATIONAL LIMITED
TORICH INTERNATIONAL LIMITED The Steel Tube Maker
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GOST 4543 Alloy Pipe for Water Wall Pannel
This pipe follow the GOST4543 which is for alloyed construction hot-rolled and forged gauged steel with diameter or thickness up to 250mm, and steel with a special surface finish, used in a thermally treated condition and produced in the form of bars, strips and hanks.
The mass fraction of phosphorus, sulfur, residual copper, nickel and chromium in steel of all grades shall not exceed the standards specified in table.
| Category of steel | Mass fraction of elements, %, no more | ||||
| Phosphorus | Sulfur | Copper | Nickel | Chromium | |
| Quality | 0.035 | 0.035 | 0.30 | 0.30 | 0.30 |
| High- quality | 0.025 | 0.025 | 0.30 | 0.30 | 0.30 |
| Extra high quality | 0.025 | 0.015 | 0.25 | 0.30 | 0.30 |
The hardness of cold-hardened steel with diameter or thickness more than 5mm shall be no more than HB 269 (diameter of imprint shall be no less than 3.7mm) or shall be stipulated by agreement between the manufacturer and the customer except for steel of grades 15X 15XA 20X 30X 35X 15T 18XTT 15XΦ whose hardness shall comply with standards specified in tables
| Grade of steel | Diameter of imprint, mm, no less than | Hardness number, HB, no more than |
| 15X 15XA | 4.1 | 217 |
| 20X | 4.0 | 229 |
| 30X | 3.9 | 241 |
| 35X | 3.8 | 255 |
| 15T | 4.2 | 207 |
| 18XTT | 4.0 | 229 |
| 15 XΦ | 4.1 | 217 |
| Heat treatment | Yield stress N/mm2 | Ultimate strength N/ mm2 | Elongation | Contraction | Shock viscosity | Dimension of billet cross section for heat treatment | ||||
| Quenching | Tempering | ||||||||||
| Temperature | Cooling medium | Tempe-rature | Cooling medium | ||||||||
| Of first quench-ing or normal-ization | Of second quenchi-ng | | |||||||||
15X | 880 | 770 to 820 | Water or oil | 180 | Air or oil | 490(50) | 690(70) | 12 | 45 | 69(7) | 15 |
| 20X | 860 | 770 to 820 | oil | 180 | Air or oil | 635(65) | 780(80) | 11 | 40 | 59(6) | 15 |
| 30X | 900air | - | oil | 500 | Water or oil | 685(70) | 880(90) | 12 | 45 | 69(7) | 25 |
| 30XPA | 860 | 860 | oil | 200 | Water or oil | 1275(130) | 1570(160) | 9 | 40 | 49(5) | - |
| 35X | 860 | - | oil | 500 | Water or oil | 735(75) | 910(93) | 11 | 45 | 69(7) | 25 |
| 38XA | 860 | - | oil | 550 | Water or oil | 785(80 | 930(95) | 12 | 50 | 88(9) | 25 |
| 40X | 860 | - | oil | 500 | Water or oil | 785(80) | 980(100) | 10 | 45 | 59(6) | 25 |
| 45X | 840 | - | oil | 520 | Water or oil | 835(85) | 1030(105) | 9 | 45 | 49(5) | 25 |
| Dimension of bars, mm | Depth of stripping of defect, no more than | |
| Quality and high quality steel | Extra high quality steel | |
| Over200 | 6% of dimension | 3% of dimension |
| From 140 to 200 | 5% of dimension | 3% of dimension |
| From 80 to 120 | Sum of maximum deviations | Half of dimension |
| Less than 80 | Half the sum of maximum deviations | |
Torich International Co.,Ltd is a professional manufacturer and exporter of steel pipes materials. It is an international marketing and sales company specialized in steel tubes, which holds the factories of Seamless Steel Tubes with Carbon and Alloy Steel Grade, Welded Precision Steel Tubes,DOM Steel Tubes, Seamless & Welded Stainless Steel Tubes with Nickel and Alloy Steel Grade.
Our factory was established since 1997, with the name of Haiyan Sanxin Steel Pipe Co., Ltd. The factories’ technicians are of great engineering experience in steel pipe industry for more than 20 years, which are in great command of production technology for Cold Drawing and Cold Rolling. So we have strong technician team and manufacturing capability.