ASTM A105 Forged Flanges Order from Vietnam

On December 6, we received an inquiry from an old customer in Vietnam. This inquiry was the same product that the customer had purchased before, and the drawings were customized for ASTM A105 forged flanges.

We have cooperated with this customer many times before, and the customer was very satisfied with our products and services. Half a month later, the customer placed an order with us and said that he believed in our quality.

ASTM A105 Forged Flanges Specification

ASTM A105 Forged Flanges are carbon steel flanges manufactured according to the ASTM A105 specification, which outlines the material requirements for forged carbon steel flanges used in pressure systems. These flanges are often used in systems that require high strength, durability, and resistance to mechanical stress.

ASTM A105 defines the material requirements for forged carbon steel flanges used in pressure systems at ambient and elevated temperatures.This means it dictates the chemical composition and mechanical properties of the steel used to make these flanges.

 

Standard	ASME B16.5
Sealing Face	RF, FF, FTJ
Size Range	1/2” to 24” / DN15 — DN600
Pressure Rating	Class 150, 300, 600, 900, 1500, 2500lb
Carbon Steel	ASTM A105 / A105N

 

ASTM A105 Forged Flanges Chemical Composition

 

CHEMICAL	LIMITS	C	Mn	P	S	Si	Ni	Cr	Mo	V
ASTM A105	MIN		0.60			0.10
	MAX	0.35	1.05	0.035	0.040	0.35	0.40	0.30	0.12	0.08

 

ASTM A105 Forged Flanges Chemical Property

 

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

 

A105 has good forging properties and is suitable for processing using forging technology. During the forging process, the material can smoothly undergo plastic deformation under pressure to obtain the desired shape and size.

It also has good machinability, including machining operations such as cutting and drilling. During the manufacturing process, A105 material can be easily subjected to various machining operations to meet different design requirements.

Forged Flange Dimension

Class 150 lb Blind Flange Dimensions & Weight Chart

 

NPS	A	C	G	H	I	J	W
	inch	inch	inch	No. of holes	inch	inch	kg/pc
	mm	mm	mm		mm	mm
1/2	3.500	0.440	1.380	4	0.620	2.380	0.42
	88.90	11.20	35.10		15.70	60.45
3/4	3.880	0.500	1.690	4	0.620	2.750	0.61
	98.60	12.70	42.90		15.70	69.85
1	4.250	0.560	2.000	4	0.620	3.120	0.86
	108.0	14.20	50.80		15.70	79.25
1-1/4	4.620	0.620	2.500	4	0.620	3.500	1.17
	117.3	15.70	63.50		15.70	88.90
1-1/2	5.000	0.690	2.880	4	0.620	3.880	1.53
	127.0	17.50	73.15		15.70	98.60
2	6.000	0.750	3.620	4	0.750	4.750	2.42
	152.4	19.10	91.90		19.10	120.7
2-1/2	7.000	0.880	4.120	4	0.750	5.500	3.94
	177.8	22.40	104.6		19.10	139.7
3	7.500	0.940	5.000	4	0.750	6.000	4.93
	190.5	23.90	127.0		19.10	152.4
3-1/2	8.500	0.940	5.500	8	0.750	7.000	6.17
	215.9	23.90	139.7		19.10	177.8
4	9.000	0.940	6.190	8	0.750	7.500	7.00
	228.6	23.90	157.2		19.10	190.5
5	10.00	0.940	7.310	8	0.880	8.500	8.63
	254.0	23.90	185.7		22.40	215.9
6	11.00	1.000	8.500	8	0.880	9.500	11.3
	279.4	25.40	215.9		22.40	241.3
8	13.50	1.120	10.62	8	0.880	11.75	19.6
	342.9	28.40	269.7		22.40	298.5
10	16.00	1.190	12.75	12	1.000	14.25	28.8
	406.4	30.20	323.9		25.40	362.0
12	19.00	1.250	15.00	12	1.000	17.00	43.2
	482.6	31.75	381.0		25.40	431.8
14	21.00	1.380	16.25	12	1.120	18.75	58.1
	533.4	35.10	412.8		28.40	476.3
16	23.50	1.440	18.50	16	1.120	21.25	76.0
	596.9	36.60	469.9		28.40	539.8
18	25.00	1.560	21.00	16	1.250	22.75	93.7
	635.0	39.60	533.4		31.75	577.9
20	27.50	1.690	23.00	20	1.250	25.00	122
	698.5	42.90	584.2		31.75	635.0
24	32.00	1.880	27.25	20	1.380	29.50	185
	812.8	47.80	692.2		35.10	749.3

 

Flange Types

ASTM A105 flanges can come in several standard types, each suited to different kinds of pipe connections:

Weld Neck Flanges

Most common in high-pressure systems, these flanges have a long tapered neck that allows for a smooth transition between the flange and the pipe. This design improves the strength of the connection.

Slip-On Flanges

 These flanges slide over the pipe and are welded on both the inside and outside. They are easier to install but are typically used in lower-pressure systems.

Blind Flanges

 Used to seal the end of a pipe, preventing flow, or for maintenance purposes.

Socket Weld Flanges

 Designed for small diameter, high-pressure applications. The pipe fits into a socket, and the flange is welded around the pipe.

Threaded Flanges

These flanges have internal threads and are screwed onto pipes with external threads, making them easy to install without welding.

Lap Joint Flange

The main structural feature of the lap joint flange is the loose connection. It consists of a flange body, a flange nipple and connecting bolts.

How to inspect forged flanges?

Measure outer diameter (OD), inner diameter (ID), bolt circle diameter (BCD), flange thickness, and bore size.

Check the raised face (RF) or ring-type joint (RTJ) face height.

Verify the bolt hole size, quantity, and spacing.

Ensure the flange face flatness to prevent leakage.

Inspect the hub height and taper for weld neck flanges.