Weld Neck & Socket Weld Flanges Order

On June 6, 2025, a long-term customer from China requested a quote for weld neck flanges and socket weld flanges made of carbon steel, stainless steel, and nickel alloy materials with different specifications and wall thicknesses. These specifications, wall thicknesses, and material types are common for us, so we quickly completed the quote, and the customer placed an order in mid-July.

If you need anything, please feel free to contact us at any time. We will do our utmost to provide you with excellent service.

Purchase List:

ITEM	DESCRIPTION	QUANTITY	UNIT
1	1-1/2 Weld Neck RF CL150 A105 ASME B16.5	6	PCS
2	2 Weld Neck RF CL150 A105 ASME B16.5 SCH80	12	PCS
3	2 Weld Neck RF CL150 A105 ASME B16.5 XXS	12	PCS
4	3 Weld Neck RF CL150 A105 ASME B16.5 SCH80	19	PCS
5	4 Weld Neck RF CL150 A105 ASME B16.5 SCH80	4	PCS
6	2 Weld Neck RF CL150 A182-F51 ASME B16.5 SCH40S	13	PCS
7	3/4 Weld Neck RF CL300 A182-F316L ASME B16.5 SCH40S	4	PCS
8	2 Weld Neck RF CL300 A182-F316L ASME B16.5 SCH80S	42	PCS
9	3 Weld Neck RF CL300 A182-F316L ASME B16.5 SCH40S	11	PCS
10	3/4 Weld Neck RF CL300 A105 ASME B16.5	4	PCS

Inspection:

Weld Neck Flanges：

1.Visual Inspection: First, inspect the sealing surface and overall surface to ensure they are smooth and flat, with no scratches, cracks, pores, or obvious welding defects.

2.Outer Diameter:  Use a caliper to measure the outer diameter of the flange and verify that it meets the standard requirements.

3.Inner Diameter:  Inspect the inner diameter of the flange to confirm it matches the dimensions of the connecting pipe, with no significant deviations.

4.Center Circle Diameter:Measure the diameter of the bolt hole distribution circle to ensure that all holes are correctly positioned on the circumference.

5.Bolt Hole Size and Quantity:Verify the size, quantity, and distribution of the bolt holes to ensure they meet the standard specifications, with uniform spacing between holes.

6.Flange Height:Measure the overall height. For necked flanges, separately check the neck height to ensure accurate dimensions.

Socket Weld Flanges：

1.Visual Inspection: Inspect the flange surface for defects such as cracks, pores, slag inclusions, scratches, or rust.

2. Outer diameter: Ensure that the measured value is within the standard tolerance range.

3. Inner diameter: Ensure that it is fully compatible with the dimensions of the pipes.

4. Thickness: Measure the thickness value to confirm that it meets the design requirements.

5. Bolt hole center circle diameter: Precisely measure the diameter of the bolt hole distribution circle.

6. Socket depth: Measure using a depth gauge to ensure the insertion depth meets welding process requirements.

7. Number of bolt holes: Count each bolt hole according to the drawing requirements to ensure the quantity is accurate and error-free.

8. Bolt hole diameter: Use a standard plug gauge to inspect each bolt hole and confirm the hole diameter meets the specified dimensions.

Material Analysis:

Chemical Composition:

CHEMICAL	LIMITS	C	Mn	P	S	Si	Cu	Ni	Cr	Mo	V	N
ASTM A105	MIN		0.6			0.1
	MAX	0.35	1.05	0.035	0.04	0.35	0.4	0.4	0.3	0.12	0.08
ASTM A182 F316	MIN							10	16	2
	MAX	0.08	2	0.045	0.03	1		14	18	3	0.1	0.1

Mechanical Properties:

MATERIAL	T.S (MPA)	Y.S (MPA)	EL %	R/A %	HARDNESS
ASTM A105	485 min	250 min	22 min	30 min	197 max
ASTM A182 F316L	485 min	170 min	30 min	50 min	–

Application Areas:

Weld Neck Flanges:

Oil and Gas

Chemical Industry

Electric Power Industry

Shipbuilding and Marine Engineering

Aerospace

Socket Weld Flanges:

Petrochemicals

Pharmaceutical industry

Food processing

Machinery manufacturing

Natural gas and liquefied gas