Yuhong Group Co.,Ltd
Yuhong Holding Group Co.,LTD
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BS 6323-5 ERW1 KM Boiler Tube
BS 6323-5 ERW1 KM Boiler Tube is a British Standard specification for electric resistance welded (ERW) carbon steel tubes used in boiler applications. The ERW1 grade indicates that the tube is manufactured using a low carbon steel material, while the KM designation signifies that the tube is suitable for high temperature and pressure boiler systems. This specification sets out the requirements for the dimensions, mechanical properties, and testing of the boiler tube to ensure its e and reliable performance in industrial boiler applications.
Steel Grade and Chemical Compositions:
| Desig nation | Chemical Compositions( ladle analysis) | Mechanical properties | |||||||||||||
| C | Si | Mn | P | S | KM (as welded) | GMK and GZF (annealed | NKM and NZF(normalzied) | ||||||||
| max. | max. | max. | max. | max. | Re min. | Rm min. | A min | A min. | Re min. | Rm min. | A min. | Re min. | Rm min. | A min. | |
| D/a≤ 20 | D/a> 20 | ||||||||||||||
| % | % | % | % | % | N/m m2 | N/m m2 | % | % | N/m m2 | N/m m2 | % | N/m m2 | N/m m2 | % | |
| ERW 1 | 0.13 | __ | 0.60 | 0.050 | 0.050 | 200 | 300 | 10 | 20 | 150 | 270 | 27 | 155 | 280 | 25 |
| ERW 2 | 0.16 | __ | 0.70 | 0.050 | 0.050 | 250 | 340 | 8 | 15 | 195 | 300 | 27 | 195 | 320 | 25 |
| ERW 3 | 0.20 | 0.35 | 0.90 | 0.050 | 0.050 | 300 | 400 | 7 | 12 | 215 | 340 | 26 | 215 | 360 | 24 |
| ERW 4 | 0.25 | 0.35 | 1.20 | 0.050 | 0.050 | 350 | 450 | 6 | 10 | 235 | 400 | 24 | 235 | 410 | 22 |
| ERW 5 | 0.23 | 0.50 | 1.50 | 0.050 | 0.050 | 420 | 420 | 6 | 8 | 340 | __ | __ | 340 | 490 | 20 |
| Diameter | Tolerance | |||
| 1 | 2 | 3 | ||
| over | Up to and including | KM condition D/a | GKM, GZF,NKM, NZF condition 20 | |
| ≤40 GKM,GZF, | ||||
| NKM, NZF condition≤20 | ||||
| mm | mm | mm | mm | mm |
| 20 | ±0.12 | ±0.18 | ±0.24 | |
| 20 | 30 | ±0.15 | ±0.22 | ±0.30 |
| 30 | 50 | ±0.20 | ±0.30 | ±0.40 |
| 50 | 70 | ±0.25 | ±0.37 | ±0.50 |
| 70 | 90 | ±0.30 | ±0.45 | ±0.60 |
| 90 | 110 | ±0.35 | ±0.52 | ±0.70 |
| 110 | 130 | ±0.45 | ±0.68 | ±0.90 |
| 130 | 150 | ±0.55 | ±0.82 | ±1.10 |
| 150 | 170 | ±0.65 | ±0.97 | ±1.30 |
| 170 | ±0.75% of outside | ±1% of outside diameter | ±1.5% of outside diameter | |
| diameter | ||||
| Tube Sizes for Heat Exchangers & Condensers & Boiler | |||||||||||
| Outside Diameter | BWG | ||||||||||
| 25 | 22 | 20 | 18 | 16 | 14 | 12 | 10 | ||||
| Wall Thickness mm | |||||||||||
| 0.508 | 0.71 | 0.89 | 1.24 | 1.65 | 2.11 | 2.77 | 3.40 | ||||
| mm | inch | Weight kg/m | |||||||||
| 6.35 | 1/4 | 0.081 | 0.109 | 0.133 | 0.174 | 0.212 | |||||
| 9.53 | 3/8 | 0.126 | 0.157 | 0.193 | 0.257 | 0.356 | 0.429 | ||||
| 12.7 | 1/2 | 0.214 | 0.263 | 0.356 | 0.457 | 0.612 | 0.754 | ||||
| 15.88 | 5/8 | 0.271 | 0.334 | 0.455 | 0.588 | 0.796 | 0.995 | ||||
| 19.05 | 3/4 | 0.327 | 0.405 | 0.553 | 0.729 | 0.895 | 1.236 | ||||
| 25.4 | 1 | 0.44 | 0.546 | 0.75 | 0.981 | 1.234 | 1.574 | 2.05 | |||
| 31.75 | 1 1/4 | 0.554 | 0.688 | 0.947 | 1.244 | 1.574 | 2.014 | 2.641 | |||
| 38.1 | 1 1/2 | 0.667 | 0.832 | 1.144 | 1.514 | 1.904 | 2.454 | 3.233 | |||
| 44.5 | 1 3/4 | 1.342 | 1.774 | 2.244 | 2.894 | 3.5 | |||||
| 50.8 | 2 | 1.549 | 2.034 | 2.574 | 3.334 | 4.03 | |||||
| 63.5 | 2 1/2 | 1.949 | 2.554 | 3.244 | 4.214 | 5.13 | |||||
| 76.2 | 3 | 2.345 | 3.084 | 3.914 | 5.094 | 6.19 | |||||
| 88.9 | 3 1/2 | 2.729 | 3.609 | 4.584 | 5.974 | 7.27 | |||||
| 101.6 | 4 | 4.134 | 5.254 | 6.854 | 8.35 | ||||||
| 114.3 | 4 1/2 | 4.654 | 5.924 | 7.734 | 9.43 | ||||||
| Form of Tube: Straight & U-bend & Finned & Coiled | |||||||||||
| Stainless Steel Tube: A/SA213, A/SA249, A/SA268, A/SA269, A/SA789, EN10216-5, A/SA688, B/SB163, JIS-G3463, GOST9941-81. | |||||||||||
| Carbon &Alloy Steel Tube: A/SA178, A/SA179, A/SA192,A/SA209, A/SA210, A/SA213, A.SA214, SA423 | |||||||||||
Application
Off-Shore Oil Drilling Companies
Power Generation
Petrochemicals
Gas Processing
Specialty Chemicals
Pharmaceuticals
Pharmaceutical Equipment
Chemical Equipment
Sea Water Equipment
Heat Exchangers
Condensers
Pulp and Paper Industry
