When installing, the 4 inch stainless steel 90 degree elbow can be directly installed on the pipeline according to the connection method, and installed according to the position of use. In general, it can be installed at any position in the pipeline, but it needs to be sealed to prevent leakage and affect the normal operation of the pipeline.
This 4-inch (NPS 4 / DN100) stainless steel 90° elbow redirects flow on medium-diameter piping runs where corrosion resistance matters more than raw strength alone. Tianjin Baode Steel produces the fitting in 304, 304L, 316, 316L, TP304 and TP316 stainless grades, with body dimensions held to ASME B16.9 and material chemistry conforming to ASTM A403. Buyers choose between long radius (center-to-end 6.00 in, 1.5D) and short radius (4.00 in, 1.0D) geometry, and between weld, threaded or flanged end connections depending on line pressure and maintenance access.
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Description
Technical Parameters
Stainless Steel Elbow · NPS 4
Built to ASME B16.9, Sized for Real Piping Layouts
A 4.500 in OD fitting engineered for pipe runs that need a corrosion-resistant direction change without a custom-fabricated bend.
1Dimensions held to ASME B16.9 - interchangeable with third-party 4 in fittings on the same schedule.
2304/316 family grades let you match media chemistry instead of over-specifying material cost.
3Schedule 5S through 80S wall options on the same OD, so upsizing pressure rating doesn't mean re-drawing the layout.
4Long radius (1.5D) or short radius (1.0D) geometry, chosen at order stage for your flow and clearance needs.
5Produced under an ISO 9001 / ISO 14001 / ISO 45001 certified quality system - certificate numbers verified below.
NPS 4 · DN100
ASME B16.9
ASTM A403
Sch 5S–80S
Technical Specifications
All figures below apply to the 4 in / NPS 4 / DN100 stainless steel 90° elbow. Product-specific procurement terms follow Tianjin Baode Steel's standard resource-library defaults where the live product page does not publish them - see notes marked .
Material & Standards
Size & Procurement
Full Dimension Chart
Grade
Reference Standard
Typical Application
304
ASTM A403 WP304
General industrial and civil piping; moderate cost, broad corrosion resistance
304L
ASTM A403 WP304L
Low-carbon variant; reduced intergranular corrosion risk after welding
316
ASTM A403 WP316
Molybdenum-alloyed for chloride/marine/chemical exposure
316L
ASTM A403 WP316L
Low-carbon 316; preferred for food, pharmaceutical and high-purity lines
TP304 / TP316
ASTM A403 (tube grade)
Thin-wall tube-fed applications
1Cr18Ni9Ti
China GB designation (titanium-stabilized austenitic)
Stabilized grade for elevated-temperature service; international equivalence confirmed on request
Dimensional standard: ASME B16.9 (butt weld fitting dimensions). Material standard: ASTM A403. Alternate size references on file: DIN 2605, JIS B2313 - contact us if your project specifies one of these instead of ASME B16.9.
Connection options: butt weld (BW), threaded, and flanged end configurations are available for the 4 in size - see Butt Weld Elbow for BW-specific detail across our elbow range.
Outside Diameter
4.500 in
114.3 mm
LR Center-to-End (A)
6.00 in
1.5D radius
SR Center-to-End (A)
4.00 in
1.0D radius
Wall Thickness Range
0.083–0.337 in
Sch 5S–80S
Schedule
Wall Thickness
LR 90° Approx. Weight
SR 90° Approx. Weight
5S
0.083 in
1.40 lb
0.90 lb
10S
0.120 in
2.00 lb
1.35 lb
40S (STD)
0.237 in
4.00 lb
2.65 lb
80S (XS)
0.337 in
5.90 lb
3.90 lb
Dimensions reconstructed from published ASME B16.9 / ASME B36.19 standard tables and Tianjin Baode Steel's published elbow weight chart for NPS 4. Confirm exact wall thickness and weight against your PO drawing before ordering.
Purchasing Information
MOQ
1 piece
Standard Lead Time
15 days (30 days in peak season)
Warranty
1 year, excluding damage from misuse or improper installation
Full weight chart for stainless steel 90° elbows across the size range Tianjin Baode Steel produces. The NPS 4 row (this product) is highlighted.
NPS (in)
LR 5S
LR 10S
LR 40S
LR 80S
SR 5S
SR 10S
SR 40S
SR 80S
1/2
0.05
0.06
0.08
0.10
0.03
0.04
0.05
0.07
3/4
0.06
0.07
0.09
0.11
0.04
0.05
0.06
0.07
1
0.09
0.15
0.18
0.20
0.06
0.10
0.12
0.13
2
0.30
0.50
0.70
0.90
0.20
0.33
0.47
0.60
3
0.90
1.30
2.00
2.90
0.60
0.90
1.35
1.90
4
1.40
2.00
4.00
5.90
0.90
1.35
2.65
3.90
6
4.00
5.00
10.5
16.0
2.70
3.35
7.00
10.5
8
7.40
10.0
21.5
33.5
4.90
6.70
14.5
22.5
12
23.4
27.0
59.0
79.0
15.6
18.0
39.5
53.0
20
73.0
85.0
146
194
49.0
57.0
98.0
129
24
122
140
210
282
82.0
94.0
140
188
Weight in lb. Intermediate sizes (1¼″–18″) available - ask us for the full published chart if your size is not listed here.
Core Features & Advantages
Grade Selection Matched to Media, Not Guesswork
Feature: six stainless grades - 304, 304L, 316, 316L, TP304, TP316 - produced to ASTM A403 on the same 4.500 in OD body. Advantage: you specify chromium-nickel or chromium-nickel-molybdenum chemistry based on what the line actually carries, instead of defaulting to whichever grade the supplier has in stock. Benefit: lines carrying chloride-bearing fluids run on 316/316L without the pitting corrosion that shortens 304 elbow service life in those conditions.
ASME B16.9 Dimensions Keep Multi-Vendor Projects on Schedule
Feature: 4.500 in OD, 6.00 in long-radius center-to-end, held to ASME B16.9 tolerances. Advantage: the fitting bolts and welds into layouts designed around any B16.9-compliant supplier's dimensions - no field re-measurement. Benefit: EPC contractors sourcing from multiple fabricators on one project avoid mismatched center-to-end lengths that force pipe spool rework.
Four Wall Schedules on One OD Simplify Pressure Upgrades
Feature: wall thickness from 0.083 in (5S) to 0.337 in (80S) on the same 4.500 in outside diameter. Advantage: moving from a low-pressure utility line to a higher-pressure process line means changing the schedule call-out, not redesigning the pipe run geometry. Benefit: engineering teams standardize pipe spool drawings across pressure classes and only swap the elbow wall spec at the BOM level.
Long or Short Radius, Decided at Order Stage
Feature: long radius (1.5D, 6.00 in center-to-end) or short radius (1.0D, 4.00 in center-to-end) geometry, both produced in-house. Advantage: long radius keeps flow resistance and erosion lower on continuous-duty lines; short radius saves space where clearance around equipment skids is tight. Benefit: you pick the geometry that fits the layout instead of redesigning the layout around whichever radius a supplier happens to stock.
Application Scenarios
01
Oil & Gas / Petrochemical
Process lines carrying sour or chloride-bearing media favor 316/316L for resistance to pitting and stress-corrosion cracking. Butt-weld ends give the compact, no-leak-path joint refineries specify on continuous-duty piping.
02
Municipal Water & Wastewater
304/304L handles standard treated-water chemistry at lower material cost than 316. Sch 10S–40S covers typical distribution pressures without over-specifying wall thickness.
03
Shipbuilding & Marine Engineering
Salt-air and seawater exposure on deck and ballast piping calls for 316's molybdenum-alloyed resistance to chloride pitting, paired with a short-radius elbow where hull compartment clearance is limited.
04
Power & Boiler Auxiliary Systems
Feedwater and auxiliary steam runs use higher schedule (40S–80S) elbows in 304/316 to hold up under elevated temperature and thermal cycling around boiler plant piping.
05
Food & Pharmaceutical Processing
304L/316L low-carbon grades resist intergranular corrosion after welding, meeting the clean, easily-passivated surface expectations of sanitary and CIP-cleaned piping runs.
OEM / ODM Service Process
1
2
3
4
1. Inquiry & Drawing Review
Send your size, grade, schedule and connection requirement (or a spool drawing). We confirm technical feasibility against our production scope before quoting.
2. Design & Sample Confirmation
For custom branding, marking or non-standard configuration, we produce a sample or shop drawing for your sign-off before batch tooling.
3. Batch Production
Production runs against the confirmed spec, with in-process spectral and dimensional checks logged at each stage - see the QC Process section below.
4. Final Inspection & Delivery
Finished elbows pass final dimensional and visual inspection, are packed to the agreed method, and scheduled against your container loading plan.
Factory Strength & Certifications
1992
Year
520
people
18
Production Equipment Set
3
ISO Certifications
ISO 9001
Quality management system
ISO 14001
Environmental management system
ISO 45001
Occupational health & safety
Material test reports (MTR) and third-party inspection (TPI) support are provided with every shipment, with heat-number traceability from raw material to finished elbow.
Frequently Asked Questions
Q: What standards and material grades apply to this 4 in stainless steel elbow?
+
A: Dimensions follow ASME B16.9. Material chemistry conforms to ASTM A403, and this product is produced in 304, 304L, 316, 316L, TP304 and TP316 stainless grades.
Q: Should I order long radius or short radius?
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A: Long radius (LR) uses a centerline radius of 1.5 times the nominal size - 6.00 in center-to-end on NPS 4. Short radius (SR) uses 1.0 times the nominal size - 4.00 in center-to-end. LR suits standard process layouts; SR addresses spatial restrictions.
Q: Which wall schedule do I need?
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A: Schedules on the 4.500 in OD body run from 5S (0.083 in) through 10S (0.120 in), 40S (0.237 in) and 80S (0.337 in). Selection depends on design pressure and the media carried - confirm against your PO drawing before ordering.
Q: Is this elbow available in seamless or welded construction?
+
A: Both configurations are offered based on diameter, pressure rating and project specification. Seamless production spans 1/2″ to 24″, while welded construction extends up to 48″.
Q: What information do you need for an accurate quotation?
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A: Provide fitting angle, radius, size, schedule, material grade, construction type, standard, quantity, and any testing or documentation requirements.
Q: What documentation and inspection support is provided?
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A: Material test certificates, inspection records and traceability reports are supplied in accordance with the agreed procurement terms. Third-party inspection (TPI) can be organized according to purchase order requirements, with inspection scopes coordinated prior to production.
Request a Quote for 4 in Stainless Steel 90° Elbows
Send size, grade, schedule, quantity and documentation requirements - we reply with pricing and lead time.
