Hot working product classification in rolling mills: the statement ‘‘The bloom is smaller than a billet’’ is — choose the correct evaluation based on standard cross-sectional size definitions.

Introduction / Context:

Primary hot-rolling products are named by their approximate cross-sectional sizes. Although different mills and standards have minor variations, the conventional hierarchy is well established. Correctly distinguishing blooms from billets is critical for downstream process planning (forging, bar rolling, section rolling).

Given Data / Assumptions:

• Standard steel mill practice terminology is assumed.
• Comparison is by cross-sectional dimensions rather than by length or weight.
• Rectangular/square sections are typical references.

Concept / Approach:

A bloom is the larger semifinished product, typically with a cross-sectional area greater than that of a billet; common textbook cutoffs place blooms above ~150 mm × 150 mm (or equivalent area), while billets are smaller square/round sections destined for wire, bar, or small sections. Therefore, the statement claiming a bloom is smaller than a billet is incorrect.

Step-by-Step Solution:

Verification / Alternative check:

Standards and handbooks typically cite blooms as >150×150 mm (or large rectangular equivalents), billets as ≤150×150 mm, acknowledging slight regional variation but the same ordering.

Why Other Options Are Wrong:

• True/conditional variants: conflict with prevalent mill practice.
• Indeterminate: while exact thresholds vary, the relative ordering (bloom larger than billet) is consistent.

Common Pitfalls:

• Confusing slabs (wide, flat) with blooms (square/rectangular) and billets (smaller).
• Using weight or length instead of cross-sectional area to define the product type.

Final Answer:

False