Threaded Flange

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Threaded pipe flange is threaded in the bore which matches an external thread on the pipe. It is easy to be installed and maintained, and can be applied in some pipelines where welding treatment is not allowed. For pipelines where there is a rapid temperature change or the temperature is lower than -45℃ or higher than 260℃, threaded flange is not suggested in case of leakage. To ensure a high pressure rating, screwed flanges are generally fabricated from die stamping and machining techniques instead of welding or casting.

Production Range

Type	Nominal diameter		Pressure
Flange America standard	1/2"~100"	DN15-DN2500	Class150~Class2500
Flange Europe standard	1/2"~100"	DN15-DN2500	PN2.5~PN400

Quality Commitment
Yuanyang’s commitment to quality is evident in every step of our process: the steel pipes, strips, bars, and sheets are purchased from trustworthy manufactruers; materials are marked with different colors so that they are easily distinguished; and 100% spectral detection is conducted for all of the finished fittings before shipping.

Commonly Used Materials

Austenitic stainless steel	Super duplex stainless steel	Nickel-based alloy steel	Carbon steel/alloy steel	Other materials
304 304L 304H 304LN	S31803 S32205	N10276 N04400 N06600	Q235 20# 20G	TA1 TA2 TA3 TC1~TC9
316 316L 316H 316Ti	S32304 S32760	N06600 N06625 N06690	WPB A105 16Mn	LF2 LF3 LF5 LF6 LF10
310S 321 321H 347	S32550 S32750	N08800 N08825 N08904	45# 15CrMo	Al, Ti, martensite
S31254	S33400	N08020 N08810 N08811	A350LF2 A420Gr.WPL6

Manufacturing Standards

Steel pipe flange for petrochemical use:	SH3406
Blind flange for steel pipes in petrochemical field:	SH3425
Steel pipe flange, washer, fasteners (PN series):	HG/T20592
Steel pipe flange (CLASS series):	HG/T20615
Large-diameter steel pipe flange (CLASS series):	HG/T20623
Steel pipe flanges:	GB/T9124
Pipe flanges and flange fittings:	ASME B16.5
Large-diameter steel flange:	ASME B16.47
Forged or rolled pipe flange, forged pipe fittings, valves and accessories:	ASTM A182/A182M
Cast steel flange fittings:	EN 1092
Steel pipe flange:	JIS B2220

Our company can provide pipe flanges according to custom need materials like austenitic stainless steel, duplex stainless steel, carbon steel and alloy steel listed as follows:
304 stainless steel pipe flange
304L stainless steel pipe flange
304H stainless steel pipe flange
304LN austenitic stainless steel pipe flange
316 stainless steel pipe flange
316L stainless steel pipe flange
316H stainless steel pipe flange
316Ti stainless steel pipe flange
310S stainless steel pipe flange
321 stainless steel pipe flange
321H stainless steel pipe flange
347 stainless steel pipe flange
S31254 austenitic stainless steel pipe flange
S31803 duplex stainless steel pipe flange
S32205 duplex stainless steel pipe flange
S32304 duplex stainless steel pipe flange
S32760 duplex stainless steel pipe flange
S32550 duplex stainless steel pipe flange
S32750 duplex stainless steel pipe flange
S33400 stainless steel pipe flange
N10276 Nickel alloy pipe flange
N04400 Nickel alloy pipe flange
N06600 Nickel alloy pipe flange
N06625 Nickel alloy pipe flange
N06690 Nickel alloy pipe flange
N08800 Nickel alloy pipe flange
N08825 Nickel alloy pipe flange
N08904 Nickel alloy pipe flange
N08020 Nickel alloy pipe flange
N08810 Nickel alloy pipe flange
N08811 Nickel alloy pipe flange
Q235 carbon steel pipe flange
20# carbon steel pipe flange
20G carbon steel pipe flange
WPB carbon steel pipe flange
A105 carbon steel pipe flange
16Mn steel pipe flange
45# carbon steel pipe flange
15CrMo alloy steel pipe flange
A350 LF2 carbon steel pipe flange
A420 grade WPL6 carbon steel pipe flange
TA1 titanium pipe flange
TA2 titanium pipe flange
TA3 titanium pipe flange
TC1—TC9 titanium alloy pipe flange
LF2 alloy steel pipe flange
LF3 alloy steel pipe flange
LF5 alloy steel pipe flange
LF6 alloy steel pipe flange
LF10 alloy steel pipe flange
Martensite stainless steel pipe flange