ASTM A182 F316H is a high-carbon version of 316 stainless steel, specifically formulated for elevated temperature service.
|
Parameter |
F316H Specification |
|
Carbon Content |
0.04–0.10% (higher than standard 316) |
|
Chromium |
16.0–18.0% |
|
Nickel |
10.0–14.0% |
|
Molybdenum |
2.0–3.0% |
|
Density |
7.93 g/cm³ (7930 kg/m³) |
|
Tensile Strength |
≥515 MPa |
|
Yield Strength |
≥205 MPa |
|
Maximum Service Temp |
Up to 800°C |
The higher carbon content in 316H provides superior high-temperature strength compared to 316L, making it the material of choice for boiler components, superheaters, and high-pressure steam systems operating above 500°C.
316H Flange Weight Chart: Common Dimensions
The following weight charts provide theoretical weights for 316H flanges manufactured to ASME B16.5 standards. These values are calculated based on stainless steel density of 7.93 g/cm³ and represent industry-standard reference weights.
Class 150 316H Flange Weights (kg)
|
NPS |
Weld Neck |
Slip-On |
Blind |
Socket Weld |
Threaded |
|
1/2" |
0.9 |
0.8 |
0.7 |
0.7 |
0.7 |
|
3/4" |
1.1 |
1.0 |
0.9 |
0.9 |
0.9 |
|
1" |
1.4 |
1.3 |
1.2 |
1.1 |
1.1 |
|
1-1/4" |
1.8 |
1.6 |
1.6 |
1.4 |
1.4 |
|
1-1/2" |
2.1 |
1.9 |
2.0 |
1.6 |
1.6 |
|
2" |
2.8 |
2.6 |
2.8 |
2.1 |
2.1 |
|
3" |
4.5 |
4.1 |
4.8 |
3.4 |
3.4 |
|
4" |
6.4 |
5.9 |
7.3 |
4.8 |
4.8 |
|
6" |
11.3 |
10.4 |
13.6 |
8.4 |
8.4 |
|
8" |
16.8 |
15.4 |
21.8 |
12.7 |
12.7 |
|
10" |
22.7 |
20.9 |
31.8 |
17.2 |
17.2 |
|
12" |
31.3 |
28.6 |
44.0 |
23.6 |
23.6 |
Class 300 316H Flange Weights (kg)
|
NPS |
Weld Neck |
Slip-On |
Blind |
Socket Weld |
Threaded |
|
1/2" |
1.1 |
1.0 |
0.9 |
0.9 |
0.9 |
|
3/4" |
1.4 |
1.3 |
1.2 |
1.2 |
1.2 |
|
1" |
1.8 |
1.6 |
1.6 |
1.5 |
1.5 |
|
1-1/4" |
2.3 |
2.1 |
2.2 |
1.9 |
1.9 |
|
1-1/2" |
3.1 |
2.8 |
3.0 |
2.5 |
2.5 |
|
2" |
4.1 |
3.7 |
4.2 |
3.2 |
3.2 |
|
3" |
7.3 |
6.6 |
8.2 |
5.4 |
5.4 |
|
4" |
10.9 |
9.8 |
13.2 |
7.7 |
7.7 |
|
6" |
19.1 |
17.2 |
24.5 |
13.2 |
13.2 |
|
8" |
29.5 |
26.8 |
39.1 |
20.9 |
20.9 |
|
10" |
41.8 |
38.2 |
57.3 |
29.1 |
29.1 |
|
12" |
57.3 |
52.3 |
79.1 |
40.0 |
40.0 |
Note: These weights are theoretical values and may vary slightly depending on manufacturing tolerances, facing type (RF/FF/RTJ), and specific forging practices.
316H Flange Standards and Pressure Classes
Flange weights are not arbitrary; they are dictated by international standards, primarily ASME B16.5 (for NPS ½" to 24") and ASME B16.47 (for larger diameters). The weight of a 316H flange is primarily driven by two variables: the Nominal Pipe Size (NPS) and the Pressure Class.
Common pressure classes include 150, 300, 600, 900, 1500, and 2500. As the pressure class increases, the flange thickness and hub diameter increase to contain higher internal pressures, resulting in a non-linear increase in weight. For instance, a Class 600 flange weighs significantly more than double a Class 150 flange of the same diameter due to the exponential increase in material volume required for safety margins.
Furthermore, the flange type influences mass. A Weld Neck flange typically weighs more than a Slip-On flange of the same class due to the extended hub and neck geometry. Conversely, a Blind flange, having no bore, will possess the highest mass for a given NPS and class.
316H Flange Weight Calculation
For engineering purposes, relying solely on charts can be risky if custom dimensions or non-standard tolerances are involved. As a manufacturer, we recommend verifying weights using the fundamental density formula. This ensures rigor in your procurement specifications.
The theoretical weight (WW) is calculated as:
W=V×ρW=V×ρ
Where:
VV = Volume of the flange (in³ or cm³)
ρρ = Density of 316H Stainless Steel (0.289 lb/in³ or 8.0 g/cm³)
Calculating the volume of a complex geometry like a Weld Neck flange requires breaking the component into simple geometric shapes: the ring, the hub, and the neck. However, for a simplified estimation of a Slip-On or Plate flange, the following formula is often utilized in the industry:
W=π4×(OD2−ID2)×T×ρW=4π×(OD2−ID2)×T×ρ
Where:
OD = Outer Diameter of the flange
ID = Inner Diameter (Bore)
T = Thickness of the flange
ρ = Density constant
Example Calculation: Consider a 6-inch NPS Class 150 Slip-On Flange.
OD = 11.00 inches
ID = 6.62 inches (approximate bore)
Thickness = 0.88 inches
Density = 0.289 lb/in³
Volume≈0.7854×(121−43.8)×0.88≈53.3 in3Volume≈0.7854×(121−43.8)×0.88≈53.3 in3 Weight≈53.3×0.289≈15.4 lbsWeight≈53.3×0.289≈15.4 lbs
Correction: This simplified formula calculates the ring only. One must add the weight of the hub and the raised face. In practice, a 6" Class 150 flange weighs closer to 26 lbs as per the ASME table. This discrepancy highlights why relying on standardized ASME weight charts is safer for commercial estimation than manual geometric calculation, unless you have access to detailed CAD models.
Factors Affecting Actual vs. Theoretical Weight
Several factors can cause variations between calculated theoretical weights and actual manufactured weights:
Manufacturing Tolerances: ASME B16.5 permits certain dimensional tolerances that affect final weight
Forging Practice: Different forging methods may result in slight material density variations
Surface Finish: Machined surfaces remove material, reducing final weight
Facing Type: Raised face, flat face, and RTJ configurations have different material volumes
Material Composition: Slight variations in alloying elements affect density
For critical applications requiring precise weight data, we recommend obtaining actual measured weights from certified mill test reports (EN 10204 Type 3.1 or 3.2).
