Views: 3 Author: Site Editor Publish Time: 2025-04-18 Origin: Site
On March 26, 2025, our old customer sent us an inquiry for 904L pipe fittings and steel pipes. This product and material has been purchased from us before, so after confirming the price, the customer quickly placed an order.
ZIZI is a company specializing in the production and processing of pipes and fittings. The company's main products include pipe fittings (such as tees, elbows, reducers), flanges, valve accessories, etc. made of carbon steel, stainless steel, alloy steel, etc., which are widely used in petrochemical, natural gas transportation, power stations, nuclear power projects and other scenes to meet the requirements of high pressure, high temperature, corrosion resistance and other harsh working conditions. The company has been deeply involved in the domestic market, with customers including well-known companies such as PetroChina, Sinopec, and State Grid, and it also exports to Southeast Asia, the Middle East, Europe and other regions, and has established a reputation in the industry with high-precision products, fast delivery and after-sales service.
ITEM | DESCRIPTION |
1 | PIPE, BE, DN25 Sch 10S, ASTM A312-N08904/SS-904L, SMLS, ASME B 36.19 |
2 | ELBOW 90°, DN25 Sch 10S, ASTM A403-N08904/SS-904L, SMLS, ASME B 16.9 |
3 | EQUAL TEE, DN125 Sch 10S, ASTM A403-N08904/SS-904L, SMLS, ASME B 16.9 |
4 | EQUAL TEE, DN50 Sch 10S, ASTM A403-N08904/SS-904L, SMLS, ASME B 16.9 |
5 | REDUCER CONCENTRIC DN 50 X 25 Sch 10S, ASTM A403-N08904/SS-904L, SMLS, ASME B 16.9 |
1. Visual Inspection
Check for:
Surface defects (cracks, pits, rust, dents)
Weld quality (smoothness, undercutting, spatter)
Correct markings (grade, size, heat number, spec code)
Tools Used: Naked eye, magnifier, borescope (for internal view)
2. Dimensional Inspection
Ensure the fitting or pipe meets standard tolerances (per ASME/ASTM).
Measurements:
Outer diameter (OD)
Wall thickness
Length and bevel angles (for pipes)
Flange face flatness, bolt hole alignment
Tools: Vernier caliper, micrometer, tape measure, angle gauge
904L Stainless Steel is a high-alloy, low-carbon austenitic stainless steel designed for exceptional corrosion resistance, especially in aggressive environments like strong acids, chlorides, and seawater. It's also known by its UNS number N08904 and WNR number 1.4539.
Superior resistance to pitting, crevice corrosion, intergranular corrosion, and stress corrosion cracking, especially in environments containing sulfuric, phosphoric, and acetic acids. It also performs well in seawater and chloride-rich environments.
ASTM A312 TP904L Stainless Steel Pipe specifications are mainly applicable to sizes ranging from 1/8” to 30” (DN6 to DN750). The wall thickness of these steel pipes must comply with ASME B36.19 standards, and the wall thickness grades are SCH 10, SCH 20, SCH 40, STD, XS, SCH 100, SCH 120, SCH 160, XXS.
| Processing Method | Seamless and Welded |
| Size Range | 1/8” - 30” / DN6 - 750 |
| Thickness Schedule | SCH 10S- SCH 160, XXS |
| Length | 6m or 12 m or Random |
| Standard | ASME B36.19 |
| Surface Treatment | Polish , Mirror , Epoxy Powder FBE, 2PE, 3PE Coating |
| Material Grade | ASTM A312 TP304/304L/304H, 316/316L, 310S, 317, 347, 904L, S32205, S31803, 32750, 32760, S32550 |
CHEMICAL | LIMITS | C | Mn | P | S | Si | Ni | Cr | Mo | N |
ASTM A312 TP904L | MIN | 23.00 | 19.00 | 4.00 | ||||||
MAX | 0.020 | 2.00 | 0.045 | 0.04 | 1.00 | 28.00 | 23.00 | 5.00 | 0.10 |
MATERIAL | T.S (MPA) | Y.S (MPA) | EL % |
ASTM A312 TP904L | 490min | 215min | 35min |
ASTM A403 – Standard specification for wrought austenitic stainless steel pipe fittings.WP904L refers to the wrought version of Alloy 904L, a high-alloy austenitic stainless steel.
Size Range | 1/2" - 80" / DN15 - 2000 |
Thickness Schedule | SCH 10, 20, 40, STD, XS, 80, 100, 120, 140, 160, XXS |
Standard | ANSI / ASME B16.9, MSS SP 43, JIS B2311/2312/2313, EN10253 |
Stainless Steel Grades | ASTM A403 WP304/304L/304H, 316/316L, 310S, 317, 347, 904L |
Tees (equal, reducing)
Reducers (concentric/eccentric)
Caps, Stub Ends, Crosses
CHEMICAL | LIMITS | C | Mn | P | S | Si | Ni | Cr | Mo |
ASTM A403 WP904L | MIN | 23.00 | 19.00 | 4.000 | |||||
MAX | 0.02 | 2.00 | 0.045 | 0.035 | 1.00 | 28.00 | 23.00 | 5.000 |
MATERIAL | T.S (MPA) | Y.S (MPA) | EL % |
ASTM A403 WP904L | 490 min | 220 min | 28 min |
Chemical Processing
Oil and Gas
Petrochemical Industry
Pulp and Paper Industry
Seawater Applications
Pharmaceutical Industry
Gas Scrubbing Plants
