ASTM A213 T92 Alloy Steel Seamless Tube

ASTM A213 T92 Alloy Steel Tube

ASTM A213 T92 Alloy Steel Seamless Tube is a type of seamless ferritic and austenitic alloy steel tube that conforms to the ASTM A213/ASME SA213 standard.

A213 T92 Seamless Steel Tube T92 Alloy Steel Tube (Grade T/P92) is a ferritic-martensitic (9 % chromium, 1.75 % tungsten, 0.5 % molybdenum) steel smaller scale alloyed with vanadium and niobium, and has controlled boron and nitrogen substance as per ASTM A 335, A 213 or to EN 10216-2 standard under the assignment X10CrWMoVNb9-2.

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ASTM A213/ASME SA213 is a specification that covers seamless ferritic and austenitic alloy steel boiler, superheater, and heat-exchanger tubes. T92 is a specific grade within this standard. These tubes are widely used in various application industry such as Oil & Gas, Power, Fertilizers, Heat-Exchangers, Paper & Pulp, pharmaceuticals, Chemicals, Water Treatment, Dairy etc.

ASTM A213 tubes

Scope

(A) Maximum, unless range or minimum is indicated. Where ellipses (...) appear in this table, there is no requirement, and analysis for the element need not be determined or reported.
(B) It is permissible to order T2 and T12 with a sulfur content of 0.045 max. See 16.3.
(C) Alternatively, in lieu of this ratio minimum, the material shall have a minimum hardness of 275 HV in the hardened condition, defined as after austenitizing and cooling to room temperature but prior to tempering. Hardness testing shall be performed at mid-thickness of the product. Hardness test frequency shall be two samples of product per heat treatment lot and the hardness testing results shall be reported on the material test report.
(D) The terms Niobium (Nb) and Columbium (Cb) are alternate names for the same element.
(A) Maximum, unless a range or minimum is indicated. Where ellipses (...) appear in this table, there is no minimum and analysis for the element need not be determined or reported.
(B) The method of analysis for Nitrogen shall be a matter of agreement between the purchaser and the producer.
(C) For these alloys, there is no common grade designation. The UNS number uniquely identifies these alloys.
(D) For small diameter or thin walls, or both, where many drawing passes are required, a carbon maximum of 0.040% is necessary in Grades TP304L, TP304LN, TP316L, and TP316LN.
(E) Grade S30434 shall have (Ti + 1/2 Nb) of not less than 2 times and not more than 4 times the carbon content.
(F) Grade TP347LN shall have an Nb content of not less than 15 times the carbon content.
(G) Grade TP348 shall have an Nb + Ta content of not less than 10 times the carbon content and not more than 1.10%.
(H) Grade TP348H shall have an Nb + Ta content of not less than 8 times the carbon content and not more than 1.10%.
(I) Iron shall be determined arithmetically by difference of 100 minus the sum of the other specified elements.
(J) Al + Ti shall be 0.85 % min; 1.20 % max.
(K) Grade TP444 shall have Ni + Cu = 1.00 max.
(L) Grade TP444 shall have Ti + Nb content not less than 0.20 + 4(C+N) and not more than 0.80 %.
(M) N08020 shall have an Nb + Ta content of not less than 8 times the carbon content and not more than 1.00%.
(N) The terms Niobium (Nb) and Columbium (Cb) are alternate names for the same element.

Grades containing the letter, H, in their designation, have requirements different from those of similar grades not containing the letter, H. These different requirements provide higher creep-rupture strength than normally achievable in similar grades without these different requirements.

The tubing sizes and thicknesses usually furnished to this specification are 1/8 in. [3.2 mm] in inside diameter to 5 in. [127 mm] in outside diameter and 0.015 to 0.500 in. [0.4 to 12.7 mm], inclusive, in minimum wall thickness or, if specified in the order, average wall thickness. Tubing having other diameters may be furnished, provided such tubes comply with all other requirements of this specification.

The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. The inch-pound units shall apply unless the “M” designation of this specification is specified in the order.

ASTM A213 T12 Seamless Alloy Pipes

Referenced Documents (purchase separately)

ASTM Standards

AWS Specifications

Terminology

Definitionx—For definitions of terms used in this speci- fication, refer to Terminology A 941.

Ordering Information

It shall be the responsibility of the purchaser to specify all requirements that are necessary for products under this specification. Such requirements to be considered include, but are not limited to, the following:

1.1 Quantity (feet, metres, or number of lengths),

1.2 Name of material (seamless tubes),

1.3 Grade (Tables 1 and 2),

1.4 Condition (hot finished or cold finished),

1.5 Controlled structural characteristics (see 6.3),

1.6 Size (outside diameter and minimum wall thickness, unless average wall thickness is specified),

1.7 Length (specific or random),

1.8 Hydrostatic Test or Nondestructive Electric Test (see 10.1),

1.9 Specification designation and year of issue,

1.10 Increased sulfur (for machinability, see Note B, Table 1, and 15.3), and

1.11 Special requirements and any supplementary require- ments selected.

General Requirements

Product furnished to this specification shall conform to the requirements of Specification A 1016/A 1016M, including any supplementary requirements that are indicated in the purchase order. Failure to comply with the general require- ments of Specification A 1016/A 1016M constitutes noncon- formance with this specification. In case of conflict between the requirements of this specification and Specification A 1016/ A 1016M, this specification shall prevail.

Materials and Manufacture

1 Manufacture and Condition—Tubes shall be made by the seamless process and shall be either hot finished or cold finished, as specified. Grade TP347HFG shall be cold finished.

Heat Treatment

1 Ferritic Alloy and Ferritic Stainlexx Steelx—The fer- ritic alloy and ferritic stainless steels shall be reheated for heat treatment in accordance with the requirements of Table 3. Heat treatment shall be carried out separately and in addition to heating for hot forming.

2 Auxtenitic Stainlexx Steelx—All austenitic tubes shall be furnished in the heat-treated condition, and shall be heat treated in accordance with the requirements of Table 3. Alter- natively, immediately after hot forming, while the temperature of the tubes is not less than the minimum solution treatment temperature specified in Table 3, tubes may be individually quenched in water or rapidly cooled by other means (direct quenched).

3 If any controlled structural characteristics are required, these shall be so specified in the order as to be a guide as to the most suitable heat treatment.

Seamless tube processing

With years of expertise, we provide a diverse array of steel tube processing options. From sawing and machining tube blanks to intricate bending and upsetting operations, we actively assist you throughout your projects.

Our capabilities extend to eccentricity reduction and concentricity enhancement through turning and grinding. We excel in creating complex geometries using processes like rotary swaging and axial forming. Additionally, we offer property modifications via partial heat treatment, ensuring tailored solutions for your specific needs.

Variable wall thicknesses

Variable wall thicknesses

Drilling / stamping / lasering

Drilling / stamping / lasering

Peeling / roller burnishing

Peeling / roller burnishing

Cold forming

Cold forming

Cutting

Cutting

Beveling

Beveling

Deburring

Deburring

Thread rolling / threading

Thread rolling / threading

Partial hardening

Partial hardening

Turning / milling / grinding

Turning / milling / grinding

Reducing / expanding

Reducing / expanding

Machining

Machining

application

Application

Alloy steel pipes are ideally suitable for chemical, petrochemicals, and other energy-related applications.

The alloy steel pipe adopts high quality carbon steel, alloy structural steel and stainless & heat resisting steel as raw material through hot rolling or cold drawn to be made.

Alloy steel can be used in process area where carbon steel has limitation such as

As an important element of steel products, alloy steel pipe can be divided into seamless steel pipe and welded steel pipe according to the manufacturing technique and tube billet shape.

Here you can see the common alloy steel grade that you will come across.

Why the application of alloy steel pipe is wider than others

There are many kinds of materials used for transport in industrial production. Specifically we will have more choices and it is not limited to the use of alloy steel pipe. But even in the face of more choices, many people tend to choose alloy steel pipe. People make their own choices will have their own reasons. This means the alloy steel pipe application has its own advantages. Compared with transmission lines made of other materials, after it meets the basic application requirements, its quantity is lighter. Then in the practical application of alloy steel pipe, it will have more advantages because of this. Besides its physical characteristic advantage, it also has economic advantages. The wide application of alloy steel pipe is with kinds of reasons. So in practical usage, we can exploit the advantages to the full, in this way can we get more profits in these applications of alloy steel pipe.

What requirements should alloy steel pipe application meet

The transportation of kinds of gases or liquids in production needs to rely on alloy steel pipe. This shows that the actual role of alloy steel pipe application is important. High temperature resistant and low temperature resistant is the tolerance of temperature. In the practical application of alloy steel pipe, there will be many materials need to be transported. However their temperatures are not the same. So this can be the basic requirement to alloy steel pipe. It needs more corrosion resistance. Corrosion resistant material is the best material during transporting, because it is corrosion resistant. So it can be used in more occasions. And it is definitely very convenient for users.

The biggest advantages of alloy steel pipe

Can be 100% recycled, environmentally friendly, energy-saving, resource conservation, national strategy, national policy to encourage the expansion of the field of application of high-pressure alloy pipe. Of alloy steel pipe total consumption accounted steel in the proportion is only half of the developed countries, to expand the field of use of the alloy steel pipe to provide a wider space for the development of the industry. The future needs of the average annual growth of China’s high-pressure alloy steel pipe long products up to 10-12%.

Specification, standard and identification of alloy steel pipes

Alloy Steel pipe contains substantial quantities of elements other than carbon such as nickel, chromium, silicon, manganese, tungsten, molybdenum, vanadium and limited amounts of other commonly accepted elements such as manganese, sulfur, silicon, and phosphorous.

Industries We Serve

Our team of experienced sales specialists proudly partners with gas and chemical processors, power generation plants, oil refineries, and related industries to offer piping components and value-added services.

The biggest advantages of alloy steel pipe can be 100% recycled, environmentally friendly, energy-saving, resource conservation, national strategy, national policy to encourage the expansion of the field of application of high-pressure alloy pipe. Of alloy tube total consumption accounted steel in the proportion is only half of the developed countries, to expand the field of use of the alloy tube to provide a wider space for the development of the industry. According to the Chinese Special Steel Association alloy pipe Branch Expert Group, the future needs of the average annual growth of China’s high-pressure alloy pipe long products up to 10-12%.

Q&A

Our team of experienced sales specialists proudly partners with gas and chemical processors, power generation plants, oil refineries, and related industries to offer piping components and value-added services.

The most important and desired changes in alloy steel are

Alloy steels are made by combining carbon steel with one or several alloying elements, such as manganese, silicon, nickel, titanium, copper, chromium and aluminum. These metals are added to produce specific properties that are not found in regular carbon steel. The elements are added in varying proportions (or combinations) making the material take on different aspects such as increased hardness, increased corrosion resistance, increased strength, improved formability (ductility); the weldability can also change.

Alloying Elements & Their Effects

Pipes, Tubes and Hollow Sections

Norms

Grade

Alloying Elements

Commonly used alloying elements and their effects are listed in the table given below.

Alloying Elements Effect on the Properties
Chromium Increases Resistance to corrosion   and oxidation. Increases hardenability and wear resistance. Increases high   temperature strength.
Nickel Increases hardenability. Improves   toughness. Increases impact strength at low temperatures.
Molybdenum Increases hardenability, high   temperature hardness, and wear resistance. Enhances the effects of other   alloying elements. Eliminate temper brittleness in steels. Increases high   temperature strength.
Manganese Increases hardenability. Combines   with sulfur to reduce its adverse effects.
Vanadium Increases hardenability, high   temperature hardness, and wear resistance. Improves fatigue resistance.
Titanium Strongest carbide former. Added to   stainless steel to prevent precipitation of chromium carbide.
Silicon Removes oxygen in steel making.   Improves toughness. Increases hardness ability
Boron Increases hardenability. Produces   fine grain size.
Aluminum Forms nitride in nitriding steels.   Produces fine grain size in casting. Removes oxygen in steel melting.
Cobalt Increases heat and wear   resistance.
Tungsten Increases hardness at elevated   temperatures. Refines grain size.

Heat Treatment and Grain Size RequirementsA

Grade UNS
Number
Heat Treat Type Austenitizing/ Solutioning Temperature, min or range ºF [ºC] Cooling Media Subcritical Annealing or Tempering Temperature, min or range ºF [ºC] ASTM
Grain S
Ferritic Alloy Steels
T2 K11547 full or isothermal anneal
    normalize and temper
    subcritical anneal 1200 to 1350
          [650 to 730]  
T5 K41545 full or isothermal anneal
    normalize and temper 1250 [675]
T5b K51545 full or isothermal anneal
    normalize and temper 1250 [675]
T5c K41245 subcritical anneal air or furnace 1350 [730]C
T9 S50400 full or isothermal anneal
    normalize and temper 1250 [675]
T11 K11597 full or isothermal anneal
    normalize and temper 1200 [650]
T12 K11562 full or isothermal anneal
    normalize and temper
    subcritical anneal 1200 to 1350
          [650 to 730]  
T17 K12047 full or isothermal anneal
    normalize and temper 1200 [650]
T21 K31545 full or isothermal anneal
    normalize and temper 1250 [675]
T22 K21590 full or isothermal anneal
    normalize and temper 1250 [675]
T23 K40712 normalize and temper 1900–1975 1350–1470 [730–800]
      [1040–1080]      
T24 K30736 normalize and tempher 1800–1975 1350–1470 [730–800]
      [980–1080]      
T36 K21001 normalize and temper 1650 [900] D 1100 [595]
T91 K90901 normalize and temper 1900–1975 1350–1470 [730–800]
      [1040–1080]      
T92 K92460 normalize and temper 1900–1975 1350–1470 [730–800]
      [1040–1080]      
T122 K91261 normalize and temper 1900–1975 1350–1470 [730–800]
      [1040–1080]      
T911 K91061 normalize and temper 1900–1975 E 1365–1435
      [1040–1080]   [740–780]  
Austenitic Stainless Steels
TP201 S20100 solution treatment 1900 [1040]F water or other rapid cool
TP202 S20200 solution treatment 1900 [1040]F water or other rapid cool
XM-19 S20910 solution treatment 1900 [1040]F water or other rapid cool
S21500 solution treatment 1900 [1040]F,G water or other rapid cool
S25700 solution treatment 1900 [1040]F water or other rapid cool
S30150: solution treatment 1900 [1040]F water or other rapid cool
TP304 S30400 solution treatment 1900 [1040]F water or other rapid cool
TP304L S30403 solution treatment 1900 [1040]F water or other rapid cool
TP304H S30409 solution treatment 1900 [1040] water or other rapid cool 7
S30432 solution treatment 2000 [1100]F water or other rapid cool
S30434 solution treatment 2120 [1160] water or other rapid cool
TP304N S30451 solution treatment 1900 [1040]F water or other rapid cool
TP304LN S30453 solution treatment 1900 [1040]F water or other rapid cool
S30615 solution treatment 1900 [1040]F water or other rapid cool
S30815 solution treatment 1920 [1050] water or other rapid cool
TP309S S30908 solution treatment 1900 [1040]F water or other rapid cool
TP309H S30909 solution treatment 1900 [1040] water or other rapid cool 7
TP309Cb S30940 solution treatment 1900 [1040]F water or other rapid cool
TP309HCb S30941 solution treatment 1900 [1040]H water or other rapid cool 7
S31002 solution treatment 1900 [1040]F water or other rapid cool
TP310S S31008 solution treatment 1900 [1040]F water or other rapid cool
TP310H S31009 solution treatment 1900 [1040] water or other rapid cool 7
TP310Cb S31040 solution treatment 1900 [1040]F water or other rapid cool
TP310HCb S31041 solution treatment 1900 [1040]H water or other rapid cool 7
TP310HCbN S31042 solution treatment 1900 [1040]F,H water or other rapid cool 7
S31060 solution treatment 1975 [1080]– water or other rapid cool 7
2160 [1180]F
S31254 solution treatment 2100 [1150] water or other rapid cool
S31272 solution treatment 1920 [1050] water or other rapid cool
S31277 solution treatment 2050 [1120]F water or other rapid cool
TP316 S31600 solution treatment 1900 [1040]F water or other rapid cool

ASTM A213M-09 Material Comparison Tables

Grade UNS Designation C Mn P S Si Vanadium Boron Niobium Nitrogen Aluminum Tungsten
T2 K11547 0.10–0.20 0.30–0.61 0.025 0.025B 0.10–0.30 ... ... ... ... ... ...
T5 K41545 0.15 0.30–0.60 0.025 0.025 0.5 ... ... ... ... ... ...
T5b K51545 0.15 0.30–0.60 0.025 0.025 1.00–2.00 ... ... ... ... ... ...
T5c K41245 0.12 0.30–0.60 0.025 0.025 0.5 ... ... ... ... ... ...
T9 K90941 0.15 0.30–0.60 0.025 0.025 0.25–1.00 ... ... ... ... ... ...
T11 K11597 0.05–0.15 0.30–0.60 0.025 0.025 0.50–1.00 ... ... ... ... ... ...
T12 K11562 0.05–0.15 0.30–0.61 0.025 0.025B 0.5 ... ... ... ... ... ...
T17 K12047 0.15–0.25 0.30–0.61 0.025 0.025 0.15–0.35 0.15 ... ... ... ... ...
T21 K31545 0.05–0.15 0.30–0.60 0.025 0.025 0.50–1.00 ... ... ... ... ... ...
T22 K21590 0.05–0.15 0.30–0.60 0.025 0.025 0.5 ... ... ... ... ... ...
T23 K40712 0.04–0.10 0.10–0.60 0.03 0.01 0.5 0.20–0.30 0.0010–0.006 0.02–0.08 0.015 0.03 1.45–1.75
T24 K30736 0.05–0.10 0.30–0.70 0.02 0.01 0.15–0.45 0.20–0.30 0.0015–0.007 ... 0.012 0.02 ...
T36 K21001 0.10–0.17 0.80–1.20 0.03 0.025 0.25–0.50 0.02 ... 0.015–0.045 0.02 0.05 ...
T91 K90901 0.07–0.14 0.30–0.60 0.02 0.01 0.20–0.50 0.18–0.25 ... 0.06–0.10 0.030–0.07  0.02 ...
T92 K92460 0.07–0.13 0.30–0.60 0.02 0.01 0.5 0.15–0.25 0.001–0.006  0.04–0.09 0.030–0.07 0.02 1.5–2.00
T122 K91271 0.07–0.14 0.7 0.02 0.01 0.5 0.15–0.30 0.0005–0.005 0.04–0.10 0.040– 0.02 1.50–2.50
T911 K91061 0.09–0.13 0.30–0.60 0.02 0.01 0.10–0.50 0.18–0.25 0.0003–0.006 0.06–0.10 0.040–0.09 0.02 0.90–1.10

ASTM A213M-09 Mechanical properties

Grade Tensile strength
(Mpa)
Yield point(Mpa)
not less than
Elongation(%)
not less than
Impact(J)
not less than
Hardness
not less than
A213 T2/SA213 T2 ≥415 205   " 85HRB
A213 T11/SA213 T11 ≥415 205   " 85HRB
A213 T22/SA213 T22 ≥415 205   " 85HRB
A213 T23/SA213 T23 ≥510 400 20 " 97HRB
A213 T24/SA213 T24 ≥585 415 20 " 25HRB
A213 T91/SA213 T91 ≥585 415 20 " 25HRB
A213 T911/SA213 T911 ≥620 440 20 " 25HRB
A213 T22/SA213 T92 ≥620 440 20 " 25HRB
A213 T122/SA213 T122 ≥620 400 20   25HRB
TP304H ≥515 205 35   90HRB
TP316H ≥515 205 35   90HRB
TP321H ≥515 205 35   90HRB
TP347H ≥515 205 35   90HRB
S30432 ≥590 235 35   95HRB
TP310HCbN ≥655 295 30   100HRB

Note

A Maximum, unless range or minimum is indicated. Where ellipses (...) appear in this table, there is no requirement, and analysis for the element need not be determined or reported.

B It is permissible to order T2 and T12 with a sulfur content of 0.045 max. See 16.3.

C Alternatively, in lieu of this ratio minimum, the material shall have a minimum hardness of 275 HV in the hardened condition, defined as after austenitizing and cooling to room temperature but prior to tempering.

Hardness test frequency shall be two samples of product per heat treatment lot and the hardness testing results shall be reported on the material test report.

Material Comparison Tables (ASTM ℃KS, JIS, DIN, BS, NBN, NF, UNI)

A 213 - Seamless Alloy Steel Boiler and Heat Exchanger Tubes

ASTMSTANDARD UNS NO. KOREA/JAPANES GERMAN BRITISH FRENCH ITALIAN
KS/JIS Symbol KS/JIS Numbe Remarks DIN Type DINNumber MateriralNumber Remarks B.SNumber B.S Grade Remarks AFNOR Type NF Number Ramarks UNI Type UNI Number Ramarks
Grade T 5 K41545 STHA 24 / STBA 25 D3572 / G3462 (30)(24) 12 CrMo 19 5 1.7362 (3a) 3606 625 (30) TUZ12C A49-213 (3a)(32) Dalmine 234(3b)
Grade T 11 K11597 STHA 22 / STBA 24 D3572 / G3462 (30)(24) 13 CrMo 44 17175 1.7335 (8)(32) 3606 621 (30) 5.05 (3b)(32)

Dalmine 227(3b)

Grade T 12 K11562 STHA 21 / STBA 22 D3572 / G3462 (30)(24)

13 CrMo 44

17175 1.7335 (32) 3606 620 (30) TU 10 CD 5.05
Grade T 22 K21590 STHA 23 / STBA 24 D3572 / G3462 (30)(24) 10 CrMo 9 10 17175 1.7380 (32) 3606 622 (30)(32) (3a)(32) 12 CrMo 9 10 5462 Dalmine 235(3b)
TP 304 S30400 STS 304 TB / SUS 304 TB D3577 / G3463 (30)(24) X5 CrNi 18 9 17440 1.4301 (3b) 3606 304S25 (30) TU 10 CD 9.10 A49-218 (3b) X5 CrNi 18 10 6904 (3b)
TP 304L S31403 STS 304LTB / SUS 304LTB D3577 / G3463

(30)(24)

X2 CrNi 18 9 17440 1.4306 (3b) 3606 304S22 (30) Z 6 CN 18.09 A49-218 (3b) X2 CrNi 18 11 6904 (3b)
TP 310 S31000 STS 310STB/SUS 210STB D3577 / G3463 (30)(24) X12 CrNi 2528 1.4845

WBL-470(3b)

(3) Z 2 CN 18.09 (3) X22CrNi 25 20 6904 (3b)(11)
TP 316 S31600 STS 316TB / SUS 316TB D3577 / G3463 (30)(24) X5 CrNiMo 18 10 17440 1.4401 (3b) 3606 316S30 (30) A49-218 (3b) X5 CrNiMo 17 12 6904 (3b)
TP 316L S211603 STS 316LTB /SUS 316LTB D3577 / G3463 (30)(24) X2 CrNiMo 18 10 17440 1.4404 (3b) 3606 316S29 (30) Z 6 CND 17.12 A49-218 (3b) X2 CrNiMo 17 12 6904 (3b)
TP 321 S32100 STS 312TB/SUS 321TB D3577 / G3463 (30)(24) X10 CrNiTi 18 9 17440 1.4541 (3b) 3606 321S22 (30) Z2 CND 17.13 A49-218 (3b) X6 CrNiTi 18 11 6904 (3b)
TP 347 S34700 STS 347TB / SUS 347TB D3577 / G3463 (30)(24) X10 CrNiNb 18 9 17440 1.4550 (3b) 3606 347S17 (30) Z6 CNT 18.11 A49-218 (3b) X6 CrNiNb 18 11 6904 (3b)
Z 6 CNNb 18.11

【H】 Ceramic lined pipe

Ceramic lined pipe is made through self-propagating high-temperature synthesis (SHS) technique.

【H】 Cast basalt lined steel pipe

Cast basalt lined steel pipe is composed by lined with cast basalt pipe, outside steel pipe and cement mortar filling between the two layers.

【H】 Ceramic Tile Lined Pipes

Ceramic tile lined pipes have very uniform coating of specially formulated ceramic material that is affixed to the inner of the pipe.

【H】 Rare earth alloy wear-resistant pipe

The material of the rare earth alloy wear-resistant pipe is ZG40CrMnMoNiSiRe, which is also the grade of rare earth alloy steel.

【H】 Tubes Erosion Shields

Tubes Erosion Shields are used to protect boiler tubing from the highly erosive effects of high temperatures and pressures thereby greatly extending tube life.

【H】 ASTM A213 T91 Alloy Tube

The ASTM A213 T91 seamless tubes are primarily used for boiler, superheater, and heat-exchanger.

Ni-Hard Wearback Pipes Ni-Hard Wearback Pipes
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