ASME SA312 UNS N08904 904L SEAMLESS STAINLESS STEEL PIPE FOR CHEMICAL PROCESSING AND CORROSIVE SERVICE
YUHONG GROUP has more than 35 years of experience in supplying seamless and welded steel pipes and tubes in carbon steel, austenitic stainless steel, duplex stainless steel, and nickel alloys, including Hastelloy, Monel, Inconel, and Incoloy. Our annual sales volume exceeds 80,000 tons, and our products have been supplied to customers in more than 85 countries. Our group companies and manufacturing facilities have obtained applicable international certifications and approvals, including CE, TÜV, LR, ABS, DNV, BV, KR, PED, AD 2000, CCS, TS, CNNC, ISO 9001, ISO 14001, OHSAS 18001, and ISO 45001.
| Element | Requirement |
|---|---|
| Carbon C | 0.020 percent maximum |
| Manganese Mn | 2.00 percent maximum |
| Phosphorus P | 0.045 percent maximum |
| Sulfur S | 0.030 percent maximum |
| Silicon Si | 1.00 percent maximum |
| Chromium Cr | 19.00 to 23.00 percent |
| Nickel Ni | 23.00 to 28.00 percent |
| Molybdenum Mo | 4.00 to 5.00 percent |
| Copper Cu | 1.00 to 2.00 percent |
| Nitrogen N | 0.10 percent maximum |
| NPS Designator | Over Tolerance from Nominal | Under Tolerance from Nominal |
|---|---|---|
| NPS 1/8 to NPS 2 1/2 inclusive all t D ratios | 20.0 percent | 12.5 percent |
| NPS 3 to NPS 18 inclusive t D up to and including 5 percent | 22.5 percent | 12.5 percent |
| NPS 3 to NPS 18 inclusive t D greater than 5 percent | 15.0 percent | 12.5 percent |
| NPS 20 and larger welded all t D ratios | 17.5 percent | 12.5 percent |
| NPS 20 and larger seamless t D up to and including 5 percent | 22.5 percent | 12.5 percent |
| NPS 20 and larger seamless t D greater than 5 percent | 15.0 percent | 12.5 percent |
UNS N08904 pipe shall be supplied in the heat-treated condition.
The minimum heat-treatment temperature specified for N08904 is 2000 degrees Fahrenheit or 1100 degrees Celsius. The pipe shall be quenched in water or rapidly cooled by another suitable method after reaching the required heat-treatment condition.
Heat-treatment control can include:
- Furnace identification
- Heat number and production lot
- Charging temperature
- Solution-treatment temperature
- Holding time
- Temperature uniformity
- Thermocouple and recorder identification
- Cooling or quenching method
- Furnace chart
- Operator and inspector identification
The final heat-treatment condition shall be stated on the Material Test Certificate when required by the purchase order.
Available documentation can include:
- EN 10204 Type 3.1 Material Test Certificate
- EN 10204 Type 3.2 Inspection Certificate when ordered
- Heat chemical analysis
- Product analysis report when required
- Mechanical test report
- Heat-treatment report and furnace chart
- Dimensional inspection report
- Hydrostatic test report
- Nondestructive examination report
- Positive Material Identification report
- Intergranular corrosion test report
- Surface-treatment report
- Certificate of conformity
- Material traceability record
- Packing list
- Packing photographs
- Third-party inspection release note
The certification shall identify whether hydrostatic testing was performed or which nondestructive electric examination method was used.
Document language, format, number of copies, electronic submission requirements, and purchaser approval sequence shall be stated in the purchase order.
ASME SA312 UNS N08904 904L seamless stainless steel pipe is used in:
- Sulfuric acid processing systems
- Phosphoric acid production equipment
- Fertilizer manufacturing plants
- Chemical process piping
- Petrochemical process units
- Refinery corrosive-service piping
- Flue gas desulfurization systems
- Pollution-control equipment
- Acid storage and transfer systems
- Pickling and acid-recovery systems
- Pulp and paper processing equipment
- Pharmaceutical process piping
- High-purity chemical systems
- Seawater and chloride-bearing process systems subject to engineering review
- Heat exchanger inlet and outlet piping
- Pressure-vessel nozzle piping
- Process skids
- Utility scrubber systems
- Offshore and marine process equipment
- Corrosive wastewater-treatment systems
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