Wrought Iron and Pig Iron – Identify the Incorrect Statement Among the following statements about wrought iron quality and pig iron manufacture, which one is NOT correct?

Introduction:
Process metallurgy questions often mix facts about defects and fuel/ore choices. Here, the objective is to detect the incorrect statement that conflicts with established practice for making wrought iron and pig iron.

Given Data / Assumptions:

• Wrought iron historically contains slag stringers and is forged at high temperature.
• Pig iron can be produced from various iron ores depending on furnace practice.
• Sulphur in fuel/charge promotes red shortness (hot brittleness) in iron products.

Concept / Approach:

Quality wrought iron demands minimizing sulphur pickup. Using sulphur-bearing fuel results in red shortness and ragged edges, so non-sulphurous fuel is in fact necessary. Statements on blistering (gas from reactions during finishing) and rough edges (red shortness) are consistent with metallurgical behavior.

Step-by-Step Solution:

Verification / Alternative check:

Historical puddling/finery and later processes emphasize low sulphur fuels; quality standards penalize sulphur content for wrought products.

Why Other Options Are Wrong:

(a) and (b) describe known defect causes. (c) is feasible with appropriate furnace chemistry. (e) cannot be correct because (d) is incorrect.

Common Pitfalls:

Assuming “all of the above” when one subtle fuel-quality statement is wrong; overlooking the specific role of sulphur in red shortness.

Final Answer:

Non-sulphurous fuel is not necessary for manufacturing wrought iron