Big Size ASTM A312 Tp 321 / 321s / 321H Stainless Steel Seamless Pipe

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Big Size ASTM A312 TP316L 321H Stainless Steel Seamless Pipe

What Are 321 / 321H Pipes?

Alloy 321 (UNS S32100) is a titanium stabilized austenitic stainless steel with good general corrosion resistance and low-temperature toughness. It has excellent resistance to intergranular corrosion after exposure to temperatures in the chromium carbide precipitation range of 800-1500°F (427-816°C). The alloy resists oxidation to 1500°F (816°C) and has higher creep and stress rupture properties than alloys 304 and 304L.
Alloy 321H (UNS S32109) is the higher carbon (0.04-0.10) version. It was developed for higher strength at temperatures above 1000°F (537°C) and enhanced creep resistance.

321 / 321H Composition Specification (%)
Weight % (all values are maximum unless a range is otherwise indicated)

Element	321	321H
Chromium	17.00 min.-19.00 max.	17.00 min.-19.00 max.
Nickel	9.00 min.-12.00 max.	9.00 min.-12.00 max.
Carbon	0.08	0.04 min.-0.14 max.
Manganese	2	2
Phosphorus	0.045	0.045
Sulfur	0.03	0.03
Silicon	0.75	0.75
Titanium	5 x (C + N) min.-0.70 max.	4 x (C + N) min.-0.70 max.
Nitrogen	0.1	0.1
Iron	Balance	Balance

321 / 321H Mechanical Properties
Typical Values at 68°F (20°C)

Yield Strength		Ultimate Tensile		Elongation	Hardness
0.2% Offset		Strength		in 2 in.	Hardness
psi (min.)	(MPa)	psi (min.)	(MPa)	% (min.)	(max.)
30,000	205	75,000	515	40	217 Brinell

321 / 321H Seamless Pipe Specification

Outer Diameter	Wall Thickness	Length	Standard
13.7-559mm DN8-DN550 1/4"-22"	1.65-60mm Sch5s-Sch XXS	≤12m	ASTM-A312 ASTM-A790 EN10216

What Is 3321 / 321H Seamless Pipe?

Steel pipes are long, hollow tubes that are used for a variety of purposes. They are produced by two distinct methods, resulting in a welded or seamless pipe.

In both methods, raw steel is first cast into a more workable starting form. It is then made into a pipe by stretching the steel out into a seamless tube or forcing the edges together and sealing them with a weld.

321 / 321H Seamless Pipe Chemical Composition

	C(max)	Si(max)	Mn(max)	P(max)	S(max)	Cr	Ni	Mo	Ti
TP304/1.4301	0.08	1	2	0.045	0.03	18.0-20.0	8.0-10.5
TP304L/1.4307	0.035	1	2	0.045	0.03	18.0-20.0	8.0-12.0
TP304H/1.4948	0.04-0.10	1	2	0.045	0.03	18.0-20.0	8.0-12.0
TP316/1.4401	0.08	1	2	0.045	0.03	16.0-18.0	11.0-14.0	2.0-3.0
TP316L/1.4404	0.035	1	2	0.045	0.03	16.0-18.0	10.0-14.0	2.0-3.0
TP316Ti/1.4571	0.08	1	2	0.045	0.03	16.0-18.0	10.0-14.0	2.0-3.0	0.7>5x(C+N)
TP321/1.4541	0.08	1	2	0.045	0.03	17.0-19.0	9.0-12.0		0.7>5x(C+N)
TP317L/1.4449	0.08	1	2	0.045	0.03	18.0-20.0	11.0-14.0	3.0-4.0
TP347H/1.4912	0.04-0.10	1	2	0.045	0.03	17.0-19.0	9.0-13.0
TP309S/1.4833	0.08	1	2	0.045	0.03	22.0-24.0	12.0-15.0	0.75
TP310S/1.4845	0.08	1	2	0.045	0.03	24.0-26.0	19.0-22.0	0.75

321 / 321H Seamless Pipe Application & Advantage

Industry & Advantage	Application	a) For fluid & gas transport
		b) Structure & machining etc
	Advantages	a) Advanced technology of cold draw machine
		b) Advanced annealing machine
		c) Better mechanical property
		d) More precise dimension
		e) Perfect inspection method and inspection equipment etc