SMLSCO: Steel In Stock, Delivered On The Dot.
ASTM A403 WP310S Stainless Steel Cap Butt Weld Fitting
High-performance stainless steel pipe caps designed specifically for power generation applications requiring exceptional heat resistance and durability.
Product Specifications
| Attribute |
Value |
| Product Name |
WP310S Stainless Steel Pipe Cap |
| Material Grade |
ASTM A403 WP310S / S31008 |
| Standard |
ASME B16.9 |
| Size Range |
DN6 - DN100 (1/8" - 4", 10.3 - 114.3mm) |
| Wall Thickness |
Sch 10s - Sch 160 / XXS |
| Connection Type |
Butt Weld |
| Heat Resistance |
Up to 1150°C (2100°F) |
| Certification |
PED 2014/68/EU, ISO 9001, AD2000 |
Material Properties
WP310S is a high-chromium, high-nickel austenitic stainless steel specifically engineered for high-temperature applications. This material features exceptional oxidation resistance and high creep strength, maintaining stable performance even under continuous service conditions up to 1150°C. Compared to standard 304 or 316 grades, WP310S offers superior resistance to carburization and reducing atmospheres at high temperatures, significantly extending service life in power generation facilities and heat treatment equipment.
Manufacturing Process
Our WP310S pipe caps undergo rigorous process control starting with high-quality stainless steel sheets from certified steel mills. After precision cutting, raw materials are pressure-formed into shape, followed by essential heat treatment to relieve processing stresses and restore corrosion resistance. Surface treatment ensures a smooth, scale-free finish, and bevels are precision-machined to meet standard requirements. Every cap undergoes 100% dimensional measurement and non-destructive testing to ensure compliance with power industry standards.
Company Advantages
- Stock Availability: Maintain inventory of standard-sized pipe fittings to meet urgent restocking needs
- Precision Manufacturing: Strict adherence to ASME B16.9 standard ensures precise geometry and smooth weld bevels
- Rapid Delivery: Standard size orders delivered within two weeks
- Certification Assurance: Full product line PED and ISO certified with 100% PMI testing before shipment
Packing Methods
| Shipment Type |
Packing Method |
| LCL Shipments |
Plywood cases with individual plastic bags or sealed packaging |
| FCL Shipments |
Plywood cases for fittings under 12"; pallet with plastic film wrapping for fittings over 12" |
Frequently Asked Questions
Does SMLSCO's WP310S pipe cap support third-party testing?
Yes. We fully support customers in commissioning third-party organizations such as SGS, TÜV, or BV to conduct on-site manufacturing supervision and re-inspection.
Why is 310S material required in the power industry instead of standard 304?
Boiler systems in the power industry often operate at temperatures exceeding 800°C. At these temperatures, 304 is prone to oxidation and flaking, whereas WP310S contains 25% chromium and 20% nickel, which form a dense oxide layer ensuring mechanical strength and structural integrity are maintained during high-temperature cycling.
How can I be sure that the pipe caps meet the high nickel-chromium content requirements of WP310S?
We conduct rigorous dual inspections upon both incoming and outgoing shipments. Every pipe cap undergoes 100% PMI testing before packaging to ensure chemical composition fully complies with ASTM A403 standard requirements.
