A234 WP91 Concentric Reducer

Product Overview

Material & Heat Treatment

Manufacturing Process

Technical Parameters

Inspection & Testing

Inspection and testing are performed according to the applicable material specification, dimensional standards and purchaser requirements.

 

Available inspection and testing services may include:​

Positive Material Identification (PMI)

Chemical Composition Analysis

Ultrasonic Testing (UT)

Mechanical Property Testing

Hydrostatic Testing

Hardness Testing

EN 10204 Type 3.1 Material Test Certificates (MTC) can be provided according to purchase requirements. Third-party inspection and additional NDT are available upon request.

Applications

FAQs

• Q:

  What is the difference between WP91, P91 and F91?

  A:

  WP91 refers to the wrought butt-weld fitting grade (ASTM A234), P91 refers to the seamless pipe grade (ASTM A335), and F91 refers to the forging grade (ASTM A182). All three grades share essentially the same chemical composition (9Cr-1Mo-V-Nb) and mechanical properties, but each is controlled by its respective ASTM / ASME material specification.

• Q:

  What heat treatment is required for WP91 reducers?

  A:

  WP91 reducers are typically supplied in the normalized and tempered condition. Normalizing is performed at a minimum of 1040°C, followed by tempering in the range of 730–800°C, to develop the required tempered martensite microstructure. Actual heat-treatment parameters depend on product size, wall thickness and applicable standards.

• Q:

  What post-weld heat treatment is required for WP91?

  A:

  PWHT may be required for WP91 depending on the applicable construction code, wall thickness, welding procedure and project requirements. Preheating and controlled interpass temperature are commonly applied. Welding should be performed using qualified procedures with PWHT applied as required by the applicable code.

• Q:

  What sizes and wall thicknesses are available?

  A:

  WP91 concentric reducers are commonly supplied in NPS 1/2–24 (DN15–DN600). Wall thicknesses are specified by applicable pipe schedules or project requirements. Custom wall thicknesses can be manufactured according to project drawings and specifications.

• Q:

  What standards are supported?

  A:

  WP91 concentric reducers are manufactured according to ASTM A234 / ASME SA234 Grade WP91. Dimensional requirements follow ASME B16.9 where applicable, and end bevels are prepared according to ASME B16.25. Material, forming, heat treatment and inspection requirements are controlled according to the applicable product specification and project requirements.