ASTM A105/ASME SA105 Pn16 En 1092-1 Carbon Steel Flanges for Industrial Applications

• Customization: Available
• Standard: ANSI, DIN, GB, JIS, GOST, BSW, BS
• Type: Forged/ Hot Press
• Model NO.: ASME A105 EN 1092-1 Carbon Steel Flanges
• Material: Stainless Steel
• Structure: Flanges
• Connection: Flanged
• Sealing Surface: RF/FM...
• Manufacturing Way: Press
• Materials: Carbon Steel
• Surface Treatment: Anodizing,Plating,Polishing,etc
• Shape: Round/Customized
• Process: Polished/Solution Treatment
• Condition: Hot Finished/Cold Finished
• MOQ: 1 Ton
• Tolerance: +/-0.005~+/-0.01mm
• Stock: Size Can Customized
• Facing: FF, RF, Rj, FM, M, T, G, etc.
• OEM ODM: Accept
• Delivery Time: 10-30 Working Days
• Size: DN 10 - DN 2000-----1/2"- 48"
• Pressure: Class150/300/600/9001500/2500
• Used: Oil and Gas Pipeline/Chemical Processing Plant/etc
• Packing: Standard Export Packing
• Transport Package: Cartons, Pallet, Cases
• Specification: SCH 5S-SCH160
• Trademark: EZS
• Origin: China
• Production Capacity: 10000 PCS/Year

Product Description

Product Description

Carbon Steel Flange ASTM A105

Specifications	ASTM A105 / ASME SA105, A105N
ASME B16.5 Carbon Steel Flanges size range	1/2" (15 NB) to 48" (1200NB) DN10~DN5000
Carbon Steel Flanges Standards	ANSI/ASME B16.5, B16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges, GOST Flanges.
Carbon Steel Flanges Standard ANSI	Class 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS
Carbon Steel Flanges Standard DIN	6Bar 10Bar 16Bar 25Bar 40Bar / PN6 PN10 PN16 PN25 PN40, PN64
Carbon Steel Flanges Standard JIS	5K, 10 K, 16 K 20 K, 30 K, 40 K, 63 K
Carbon Steel Flanges Standard UNI	6Bar 10Bar 16Bar 25Bar 40Bar
Carbon Steel Flanges Standard EN	6Bar 10Bar 16Bar 25Bar 40Bar
Main Types	Forged / Threaded / Screwed / Plate
Flange supporting material	Gasket, Ring Joint, Flange Bolts
Carbon Steel Pipe Flanges Test Certificates	EN 10204/3.1B Raw Materials Certificate 100% Radiography Test Report Third Party Inspection Report, etc
Most common types of Carbon Steel Flanges	Weld Neck Ring Flange (WNRF), Carbon Steel Flanges Slip-On Ring Flange (SORF), Carbon Steel Flanges Blind Ring Flange (BLRF), Carbon Steel Flanges Socket Weld Ring Flange (SWRF), Carbon Steel Flanges Threaded Ring Flange, Carbon Steel Flanges Lap Joint Ring Flange (LJRF), Carbon Steel Flanges Ring Type Joint Flange (RTJF), Carbon Steel Flanges
Production technique	Forged, Heat treated and machined
Connect Type/ Flange Face Type	Raised Face (RF), Ring Type Joint (RTJ), Flat Face (FF), Large Male-Female (LMF), Lap-Joint Face (LJF), Small Male-Female (SMF), Small Tongue, Large Tongue & Groove, , Groove

 

 

1. Standard and Material 

• ASTM A105/ASME SA105: Defines carbon steel forgings for pipe flanges, fittings, and valves used in pressure systems at ambient to moderate temperatures (up to ~400°C).
• EN 1092-1: European standard specifying requirements for steel flanges, including dimensions, materials, and testing for pressure applications.
• Material: Low-carbon steel (C ≤ 0.35%) with manganese (Mn 0.60-1.05%) and trace elements (P ≤ 0.035%, S ≤ 0.035%), offering good strength and weldability.

2. Chemical Composition (ASTM A105)

Element	Range (%)	Role
Carbon (C)	≤ 0.35	Determines strength; lower carbon improves weldability.
Manganese (Mn)	0.60-1.05	Enhances strength and hardenability; controls sulfur-induced brittleness.
Phosphorus (P)	≤ 0.035	Limits brittleness; excess reduces impact toughness.
Sulfur (S)	≤ 0.035	Minimizes hot shortness (embrittlement during heating).
Silicon (Si)	≤ 0.35	Deoxidizer; improves fluidity in casting.

3. Mechanical Properties

• Tensile Strength: Min. 485 MPa (70 ksi)
• Yield Strength: Min. 250 MPa (36 ksi)
• Elongation: Min. 22% in 50 mm gauge length
• Impact Resistance: Not mandatory per ASTM A105, but often specified for low-temperature applications (e.g., Charpy V-notch test at -20°C for EN 1092-1 compliance).

4. Flange Types and Dimensions (EN 1092-1)

• Types Covered:
  • Weld Neck Flanges (WN): Long tapered hub for stress relief in high-pressure/high-temperature systems.
  • Slip-On Flanges (SO): Simple design for easy installation; welded on both sides.
  • Blind Flanges (BL): Solid discs to seal pipe ends.
  • Socket-Weld Flanges (SW): For small-bore pipes (NPS ≤ 4), welded into a socket.
  • Threaded Flanges (TH): Threaded bore for non-welded connections (rare in high-pressure systems).
• Dimensions:
  • Nominal Pipe Size (NPS) from 1/2" to 48"
  • Pressure classes: PN 6, PN 10, PN 16, PN 25, PN 40, PN 63, PN 100, PN 160 (EN 1092-1)
  • Face types: Flat Face (FF), Raised Face (RF), Ring Type Joint (RTJ), etc.

5. Compliance and Certification

• ASTM A105 vs. EN 1092-1:
  • ASTM A105: Primarily used in North America, focuses on material properties.
  • EN 1092-1: European standard, specifies flange dimensions, tolerances, and marking.
• Certification Requirements:
  • Material Test Certificates (MTCs) per EN 10204:2.1 or 3.1
  • CE marking for products placed on the EU market
  • Optional third-party inspection (e.g., Lloyd's, DNV) for critical applications.

6. Manufacturing and Quality Control

• Production Process:
  1. Hot forging from carbon steel billets to refine grain structure and improve strength.
  2. Machining to meet dimensional tolerances (e.g., face flatness, bore diameter).
  3. Heat treatment: Normalizing (heating above critical temperature, then air-cooling) to improve mechanical properties.

7. Applications and Industry Use

• Suitable for:
  • Oil and gas pipelines (onshore and offshore)
  • Chemical processing plants
  • Power generation (steam systems)
  • Water treatment and general industrial piping

 

Technical Details

Pressure-Temperature Rating

The pressure-temperature rating is the maximum allowable working pressure (bar unit) of the material and grade used at the rated temperature (Celsius).

Temperature Consideration

Whether flange joints are used at high or low temperatures, leakage due to external forces and moments generated by the connected piping or equipment should be considered. To prevent leakage, pipe flanges and flanged fittings should avoid the application of severe external loads and sharp thermal gradients.

High Temperature

Application at temperatures in the creep range will result in decreasing bolt loads as relaxation of flanges, bolts, and gaskets takes place. Flanged joints subjected to thermal gradients may likewise be subject to decreasing bolt loads. Decreased bolt loads diminish the capacity of the flanged joint to sustain loads effectively without leakage. At temperatures above 200°C (400°F) for Class 150 and above 400°C (750°F) for other class designations, flanged joints may develop leakage problems unless care is taken to avoid imposing severe external loads, severe thermal gradients, or both.

Low Temperature

Some materials, especially some carbon steel materials, exhibit a significant decrease in ductility when used at low temperatures, and thus cannot withstand impact load, sudden stress changes, and high stress concentrations. Some regulations require an impact test even when the temperature is above -29 °C (−20°F).

 

Detailed Photos

Processing of Production

 

Packaging & Shipping

Pressure Test

No pressure test is required on the flange.
Flanged fitting should be tested for shell pressure.

Shell Pressure Test for Flanged Fittings
The shell pressure test for flanged fittings shall be at a pressure no less than 1.5 times the 38°C (100°F) pressure rating rounded off to the next higher 1 bar (25 psi) increment.

Test Conditions
The shell pressure test for flanged fittings shall be at a pressure no less than 1.5 times the 38°C (100°F) pressure rating rounded off to the next higher 1 bar (25 psi) increment

Test Duration

Flanged Fittings Size	Duration, Sec
NPS ≤ 2	60
2 1/2 ≤ NPS ≤ 8	120
NPS ≥ 10	180