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ASTM A335 Seamless Alloy Steel Tube

Name: ASTM A335 Seamless Alloy Steel Tube Manufacturers and Suppliers China - Professional Factory - Wanlei Steel Pipe
Brand: Wanlei Steel Pipe
SKU: 170561718

ASTM A335 applies to ferritic seamless alloy steel pipes with nominal and minimum wall thickness for high temperature use.Tubes ordered to this standard shall be suitable for bending,crimping(hot rolling closing) and similar forming processes,as well as fusion welding.

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Description

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Introduction

ASTM A335 steel tubes can be hot treating or cold-drawn,and subjected to final heat treatment.

Grade P12 steel shall be made by coarse grain melting.

If there are special provisions on grain size or deoxygenation, it shall be agreed between the buyer and the manufacturer.

Chemical Composition

Grade	UNS Designation^a	Chemical Composition
Grade	UNS Designation^a	C	Mn	P	S	Si	Cr	Mo
P5	K41545	≤0.15	0.30-0.60	≤0.025	≤0.025	≤0.50	4.00-6.00	0.45-0.65
P11	K11597	0.05-0.15	0.30-0.60	≤0.025	≤0.025	0.50-1.00	1.00-1.50	0.44-0.65
P12	K11562	0.05-0.15	0.30-0.61	≤0.025	≤0.025	≤0.50	0.80-1.25	0.44-0.65
a:New designation is determined in accordance with ASTM E527 and SAE J1086 standards,metal and alloy Numbering specification UNS.

Mechanical Property

Table 1.

Grade	Tensile Strength	Yield Strength
P5	≥415Mpa	≥205Mpa
P11	≥415Mpa	≥205Mpa
P12	≥415Mpa	≥220Mpa

Table 2.

Elongation in 2 in. or 50mm	P5,P11,P12
Elongation in 2 in. or 50mm	Longitudinal	Transverse
Basic elongation of strip samples with WT greater than 5/16 in.(8mm) and all small size samples for full face surface tests	≥30%	≥20%
Using standard circular samples with a spacing of 2 in.or 50mm,or small scale samples with a spacing of 4OD	≥22%	≥14%
The percentage decrease in basic elongation for every 0.8mm decrease of strip sample(WT:8mm)	≥1.50%	≥1.00%

Process

1. Steel tubes may be finished thermally or cold drawn,and subjected to final heat treatment as required by the standards.

2. Heat treatment requirements

Grade	Form of Heat Treatment	Subcritical Annealing or Tempering Temperature
P5	Complete annealing or isothermal annealing Normalizing and tempering	... ≥1250℉(675℃)
P11	Complete annealing or isothermal annealing Normalizing and tempering	... ≥1200℉(650℃)
P12	Complete annealing or isothermal annealing Normalizing and tempering Subcritical annealing	... ≥1200℉(650℃) 1200℉-1300℉(650℃-705℃)

Tolerances of Outer Diameter and Wall Thickness

Table 3. Tolerances of Outer Diameter

NPS[DN] Designation	Over		Under
NPS[DN] Designation	in.	mm.	in.	mm.
1/8~1½[6~40]	1/64	0.40	1/64	0.40
>1½~4[40~100]	1/32	0.79	1/32	0.79
>4~8[100~200]	1/16	1.59	1/32	0.79
>8~12[200~300]	3/32	2.38	1/32	0.79
>12[300]	Specify ±1% of the outer diameter

Table 4. Tolerances of Wall Thickness

NPS[DN] Designation	Deviation from Nominal Wall Thickness
NPS[DN] Designation	Over	Under
1/8~2½[6~65],all WT/OD	20.0%	12.5%
>2½[65],WT/OD≤5%	22.5%	12.05%
>2½[65],WT/OD>5%	15.0%	12.5%