Chrome Moly Pipe has become a standard in the power generation industry and the petrochemical industry, not only because of its tensile strength, corrosion resistance and high-temperature strength, but also because of its cost-effectiveness. Grades P-11, P-22 – P-91 & P-92 are prevalent grades for the power industry, while P-5 & P-9 are the grades utilized in major refinery processing.
| Trade Name | Grade | UNS # | Pipe | Forged / Bored Pipe |
|---|---|---|---|---|
| 1 1/4 Chrome | P11 | K11597 | A335 / SA335 | A369 / SA369 |
| 2 1/4 Chrom | P22 | K21590 | A335 / SA335 | A369 / SA369 |
| 5 Chrome | P5 | K41545 | A335 / SA335 | A369 / SA369 |
| 9 Chrome | P9 | S50400 | A335 / SA335 | A369 / SA369 |
| P91 | P91 | K91560 | A335 / SA335 | A369 / SA369 |
| P92 | P92 | K92460 | A335 / SA335 | A369 / SA369 |
Work Scope
This specification covers nominal wall and minimum wall seamless ferritic alloy-steel pipe intended for high-temperature service. Pipe ordered to this specification shall be suitable for bending, flanging (vanstoning), and similar forming operations, and for fusion welding. Selection will depend upon design, service conditions, mechanical properties, and high-temperature characteristics.
Review of Procurement Requirements:
It shall be the responsibility of the purchaser to specify all necessary requirements. Such requirements to be considered include, but are not limited to, the following:
- Quantity (feet, metres, or number of lengths)
- Name of material (seamless tubes)
- Grade
- Condition (hot finished or cold finished)
- Controlled structural characteristics
- Size (outside diameter and minimum wall thickness, unless average wall thickness is specified)
- Length (specific or random)
- Hydrostatic Test or Nondestructive Electric Test
- Increased sulfur (for machinability)
- Specification designation and year of issue
- Special requirements and any supplementary requirements selected
| Trade Name | Grade | Welded Pipe |
|---|---|---|
| 1 1/4 Chrome | 1 1/4CR | A691 / SA691 |
| 2 1/4 Chrom | 2 1/4CR | A691 / SA691 |
| 5 Chrome | 5CR | A691 / SA691 |
| 9 Chrome | 9CR | A691 / SA691 |
| P91 | 91 | A691 / SA691 |
Materials in industry standard designations: STD, 40, XH, 60, 80, 100, 120, 140, 160, XXH
Special customer designated nominal and minimum wall thicknesses can also be furnished.
Non standard OD & ID are available.
Pipe manufactured to this specification is normally furnished in outside diameters 16 inch and larger with wall thicknesses up to and including 3 inches.
Pipe having other size and wall thickness dimensions are permitted provided all other requirements of this specification are met. Manufacturer’s acceptance of special dimensions would have to be obtained prior to placement of an order.
Work Scope
This specification covers electric-fusion-welded alloy-steel pipe intended for high pressure at high-temperature service fabricated from pressure-quality plate.
Review of Procurement Requirements:
The inquiry and order for material under this specification should include the following information:
- Quantity (feet, metres, or number of lengths)
- Name of material (steel pipe, electric-fusion-welded)
- Specification number
- Grade and class designation
- Size (inside or outside diameter, nominal or minimum wall thickness)
- Length (specific or random)
- End finish
- Purchase options
- Supplementary requirements
| Trade Name | Grade | UNS # | Heater Tubes |
|---|---|---|---|
| 1 1/4 Chrome | T11 | K11597 | A213 / SA213 |
| 2 1/4 Chrom | T22 | K21590 | A213 / SA213 |
| 5 Chrome | T5 | K41545 | A213 / SA213 |
| 9 Chrome | T9 | k90941 | A213 / SA213 |
| P91 | T91 | K90901 | A213 / SA213 |
| P92 | T92 | K92460 | A213 / SA213 |
Work Scope:
This specification covers minimum and average wall seamless ferritic alloy tubes usually furnished with a 1/8 inch inside diameter up to a 5 inch outside diameter. Other diameters may be furnished, provided that all other requirements of this specification sre met. The wall thickness, either average or minimum, is normally available up to 0.500 inches, inclusive.
Review of Procurement Requirements:
It shall be the responsibility of the purchaser to specify all necessary requirements. Such requirements to be considered include, but are not limited to, the following:
- Quantity (feet, metres, or number of lengths)
- Name of material (seamless tubes)
- Grade
- Condition (hot finished or cold finished)
- Controlled structural characteristics
- Size (outside diameter and minimum wall thickness, unless average wall thickness is specified)
- Length (specific or random)
- Hydrostatic Test or Nondestructive Electric Test
- Increased sulfur (for machinability)
- Specification designation and year of issue
- Special requirements and any supplementary requirements selected
Sizes
Materials in industry standard designations: STD, 40, XH, 60, 80, 100, 120, 140, 160, XXH
Special customer designated nominal and minimum wall thicknesses can also be furnished.
Non standard OD & ID are available.
1/4” Nominal to 24”O.D. Seamless Pipe
Chrome Moly Pipe Specifications & Grades
SA335 & A335 – Grades P5, P9, P11, P22, P91, P92
A691 1-1/4 Chrome through 9 Chrome (Welded Alternative to A335)
Flanges & Fittings
Alloy Butt Weld Fittings: A/SA-234
- WP-5, WP-9, WP-11 (Class 1 & 2), WP-22 (Class 1 & 3), WP-91, WP-92
Alloy Forged Fittings & Flanges: A/SA-182
- F-5, F-9, F-11 (Class 1 & 2), F-22 (Class 1 & 3), F-91, F-92
