XM-19 Stainless Steel Pipe Fittings
Metracore Alloys manufactures XM-19 stainless steel pipe fittings under a dual-certification production system, releasing every lot against ASTM A403 and ASME SA403 requirements at the same time. XM-19 identifies UNS S20910 within the ASTM framework: A182 lists the grade as F XM-19 for forgings, while A403 covers wrought buttweld components as WPXM-19.
Code acceptance carries real design value. Pressure piping and vessel codes recognize the SA403 designation with published allowable stresses, so engineers substantiate XM-19 lines without special approvals. Naval shipboard systems and nuclear plants have run the alloy for decades. Both sectors qualify piping materials conservatively.
Behind the designations sits a high-strength austenitic stainless steel combining corrosion resistance, mechanical strength, toughness, and wear resistance in one nitrogen-strengthened composition. Piping exposed to harsh operating conditions and corrosive media, whether offshore, chemical, or marine, runs on these fittings for full inspection cycles. Send us your piping class and dimensions for a certified, priced quotation.
What Are XM-19 Stainless Steel Pipe Fittings?
XM-19 Stainless Steel Pipe Fittings are pressure-boundary components produced in UNS S20910, the grade ASTM registered under the XM-19 designation. Yield strength reaches 380 MPa minimum in the annealed state. Molybdenum and nitrogen defend against pitting, and the matrix resists chloride-driven cracking. Galling and wear performance sit well above the 304 and 316 levels, so joints assemble repeatedly without surface damage. The grade doesn’t demand exotic fabrication; standard austenitic welding procedures apply. That balance keeps high-pressure joints dependable across long inspection intervals.
Why Choose Metracore Alloys?
- XM-19 Stainless Steel Pipe Fittings Specifications
- Available Product Range
- Technical Details of XM-19 Stainless Steel Pipe
- Chemical Composition of XM-19 Stainless Steel Pipe Fittings
- Mechanical Properties of XM-19 Stainless Steel Pipe Fittings
- Manufacturing Process of XM-19 Stainless Steel Pipe
- Typical Industrial Applications
- FAQs
XM-19 Stainless Steel Pipe Fittings Specifications
Material Grade
XM-19 high-strength austenitic stainless steel
UNS Number
S20910
ASTM / ASME Standards
ASTM A403 WPXM-19; ASME SA403; and forged items to ASTM A182 F XM-19
Available Sizes
1/2" NB through 24" NB (buttweld); up to 4" (socket weld)
Wall Thickness
Matched to the connecting pipe schedule
Schedule
SCH 10S to SCH XXS
Pressure Rating
Buttweld per pipe schedule; forged socket weld Class 3000 and 6000
Dimensional Standards
ASME B16.9, ASME B16.28, MSS SP-43, ASME B16.11
Inspection & Testing
PMI, dimensional, hydrostatic, mechanical, visual
Certification
EN 10204 Type 3.1 Mill Test Certificate
Available Product Range
Our forming and forging lines produce ten configurations. Nine are XM-19 buttweld pipe fittings; forged socket weld patterns complete the set.
90° Elbow
45° Elbow
Equal Tee
Reducing Tee
Concentric Reducer
Eccentric Reducer
Stub End
Pipe Cap
Cross
Reach out to Metracore Alloys for XM-19 Stainless Steel Pipe Fittings
Technical Details of XM-19 Stainless Steel Pipe Fittings
Chemical Composition of XM-19 Stainless Steel Pipe Fittings
| Element | Chromium (Cr) | Nickel (Ni) | Manganese (Mn) | Molybdenum (Mo) | Nitrogen (N) | Niobium (Nb) | Vanadium (V) | Carbon (C) | Silicon (Si) | Iron (Fe) |
| Content (wt%) | 20.5 – 23.5 | 11.5 – 13.5 | 4.00 – 6.00 | 1.50 – 3.00 | 0.20 – 0.40 | 0.10 – 0.30 | 0.10 – 0.30 | 0.06 max | 1.00 max | Balance |
Mechanical Properties of XM-19 Stainless Steel Pipe Fittings
| Property | Tensile Strength | Yield Strength (0.2% offset) | Elongation | Hardness | Density | Modulus of Elasticity |
| Value | 690 MPa min | 380 MPa min | 35% min | 96 HRB (typical, annealed) | 7.88 g/cm³ | 196 GPa |
Performance Advantages
Eight gains explain the move to XM-19 stainless steel fittings when leaner grades reach their limits.
- Corrosion protection comes from 20.5 to 23.5% chromium working with molybdenum and nitrogen to block localised chloride corrosion.
- A 380 MPa yield floor comes straight from the anneal, so pressure ratings climb or walls thin out.
- Galling resistance means mating faces don’t drag or seize during repeated make-up, sparing threads and gasket surfaces.
- Impact toughness survives sub-zero and cryogenic excursions, guarding girth welds against brittle fracture.
- Fatigue strength holds up under pulsating pressure better than standard 300-series grades manage.
- Fabrication follows familiar austenitic welding practice with matching consumables.
- Long service interval replacement cycles sit decades apart in severe duty.
- Maintenance costs fall because wear, seizure, and corrosion all slow at once.
Standards & Quality Assurance
Wrought production leaves our works as ASTM A403 XM-19 pipe fittings, while orders written to pressure vessel code requirements are certified as ASME SA403 XM-19 pipe fittings. ASME B16.9 sets buttweld dimensions, short-radius geometry sits under ASME B16.28, light-wall patterns rely on MSS SP-43, and socket weld items follow ASME B16.11.
Quality assurance runs in five stages. PMI establishes grade identity, dimensional inspection gauges each lot, hydrostatic testing proves the pressure boundary, mechanical tests qualify the parent heat, and visual review completes release. EN 10204 3.1 certification records every result.
Manufacturing Process of XM-19 Stainless Steel Pipe Fittings
Typical Industrial Applications
Products
Exporter, Manufacturer & Supplier of XM-19 Stainless Steel Pipe Fittings in various material and sizes.
FAQs
What Are XM-19 Stainless Steel Pipe Fittings?
XM-19 Stainless Steel Pipe Fittings are UNS S20910 connectors built for corrosive pressure duty, supplied to ASTM A403 or ASME SA403.
Is XM-19 the same as Nitronic® 50?
Yes. Both names identify UNS S20910, so Nitronic 50 pipe fittings and XM-19 fittings share one chemistry; they’re a single alloy.