Alloy-Steel Boiler Tubes

Alloy-Steel Boiler Tubes

Alloy-steel Boiler Tubes A250 Brief Introduction. Alloy steel boiler tubes according to ASTM A250 standard. It covers standard specification for several grades, designated T1, T1a, T1b, T2, T11, T12, and T22, of minimum-wall-thickness, electric-resistance-welded, carbon-molybdenum and...

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Product Details

Alloy-Steel Boiler Tubes

 

Brief Introduction

Alloy steel boiler tubes are based on ASTM A250 standard. It covers standard specification for several grades, designated T1, T1a, T1b, T2, T11, T12, and T22, of minimum-wall-thickness, electric-resistance-welded, carbon-molybdenum and chromium-molybdenum alloy-steel, boiler and superheater tubes.

The tubes shall have a hardness not exceeding the specified values for brinell hardness and rockwell hardness numbers. When the final heat treatment is in a continuous furnace, the number of tubes of the same size and from the same heat in a lot shall be determined from the given size of the tubes.


ASTM A250.jpg


Specificaton

Standard

ASTM A250

Steel Grade

T1, T1a, T1b, T2, T11, T12, and T22

Size Range

Size: OD 1/2"-5"(12.7-127mm), Wall thickness: 0.035"-0.320" (0.9-8.1mm)

Certificate

The products are supplied with 3.1 specific test certificates, according to EN 10204. Certification according to 3.2 can be agreed at the time of ordering.

Product Type

Hot rolled welded steel tube ,seamless boiler pipe, straight pipe,

Description 

ASTM A250 Standard Specification for Electric-Resistance-Welded Ferritic Alloy-Steel Boiler and Superheater Tubes


Chemical Composition:

Grade

T1

T1a

T1b

T2

T11

T12

T22

C≤

0.10~0.20

0.15~0.25

0.14

0.10~0.20

 

 

 

Mn≤

0.30~0.80

0.30~0.80

0.30~0.80

0.30~0.61

0.30~0.60

0.30~0.61

0.30~0.60

P≤

0.025

0.025

0.025

0.025

0.025

0.030

0.025

S≤

0.025

0.025

0.025

0.020

0.020

0.020

0.020

Si≤

0.10~0.50

0.10~0.50

0.10~0.50

0.10~0.30

0.50~1.00

0.50

0.50

Mo≤

0.44~0.65

0.44~0.65

0.44~0.65

0.44~0.65

0.44~0.65

0.44~0.65

0.87~1.13

Cr≤

-

 

 

0.50~0.81

1.00~1.50

0.80~1.25

1.90~2.60


ASTM A250.jpg


Manufacturing Process:

Electric-resisitance welding


Heat Treatment:

1. After welding or when cold finished, after the final cold-drawing pass, all tubes shall be heat treated and, except asprovided in 5.3.2. furnished in the full annealed, isothermal annealed, normalized, or normalized and tempered condition at the option of the manufacturer, if furnished in the normalized and tempered condition, the minimum temperingtemperature shall be 1200°F except T22 shall be tempered at 1250°minimum.

2. when grades T1, T1a, T1b and T2 are cold finished, the tubes may at the option of the manufacturer, be heat treated after the final cold-drawing pass at a temperature of 1200°F or higher, provided one of the heat treatments specified in 5.3.1 was applied after welding.

Resistant high and low temperature or resistant corrosion-resistant in the oil, chemical, electric powder industry. KRM is a professional alloy steel pipe manufacture and supplier. We stock large quality of A-250 T22 straight alloy steel pipe every month. If you have any need of ASTM A-250 please do not hesitate to contact us .


Edit by Mr. Bruce Zhang of KRM/BSW

Contact us directly by:  

Email: bruce@kingruimansteelpipe.com  

Tel / Whatsapp: +86-18046588367

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