Ultra High-Purity Process Piping for
Semiconductors and LCD Display Devices
CREST UHP-151 is precision-engineered and manufactured welded-as-seam-less (WSL) according to stainless steel pipe specifications of ASTM A312 and/or JIS G3459 with the specific purpose of servicing ultra high-purity applications in the area of semiconductor, LCD display device and polysilicon industries. For the process piping works of bulk utility gas distribution, scheduled pipe sizes up to OD 24-inches (609.60mm), or even greater sizes, are offered in EP BA MP AP finishes.
| Pipe Size Dimension | |
|---|---|
| OD [NPS or A-size (mm)] | WT [mm] |
| 8 (219.08) | 3.76 |
| 10 (273.05) | 4.19 |
| 12 (323.85) | 4.57 |
| 14 (355.60) | 6.35 |
| 20 (508.00) | 9.53 |
| 40A (48.6) | 1.65 |
| 50A (60.5) | 1.65 |
| 65A (72.3) | 2.10 |
| 80A (89.1) | 2.10 |
| 100A (114.3) | 2.10 |
| 150A (165.2) | 2.80 |
| 200A (216.3) | 2.80 |
| 250A (267.4) | 3.40 |
| 300A (318.5) | 4.00 |
| 400A (406.4) | 7.92 |
| 500A (508.0) | 9.53 |
| 600A (609.6) | 9.53 |
| Code | Specifications | Choice of Pre-Materials | Surface Finish (max) | ||
|---|---|---|---|---|---|
| AP | A213/A269 A269/A270 A312 JIS G3459 |
304L 316L SUS316L (JIS) 316L (sulfur 0.005%~0.017%) |
ID | Weld Bead Removed | Annealed |
| OD | < 32 RA | < 0.8 μm | |||
| MP | A213/A269 A269/A270 A312 JIS G3459 |
304L 316L SUS316L (JIS) 316L (sulfur 0.005%~0.017%) |
ID | < 20 RA | < 0.5 μm |
| OD | < 32 RA | < 0.8 μm | |||
| BA | A213/A269 A269/A270 A312 JIS G3459 |
304L 316L SUS316L (JIS) 316L (sulfur 0.005%~0.017%) |
ID | < 15 RA | < 0.4 μm |
| OD | < 32 RA | < 0.8 μm | |||
| EP | A213/A269 A269/A270 A312 JIS G3459 |
304L 316L SUS316L (JIS) 316L (sulfur 0.005%~0.017%) |
ID | < 10 RA | < 0.25 μm |
| OD | < 32 RA | < 0.8 μm | |||