This sentence is wrong, because will is a spiritual product that needs to be built, and steel is an objective object, so will expresses a process. It's like: The will of the Communists is as strong as steel, using metaphorical rhetoric to describe the strong will of the Communists. Source: A famous saying by Sister Jiang (Jiang Zhuyun).

Like the original text: Torture is too small a test. Bamboo sticks are made of bamboo, and the will of Communist Party members is made of steel.

Extended information:

Sister Jiang’s personal experience:

1. Jiang Zhujun was born on August 20, 1920 in Jiangjia Town, Dashanpu Town, Da’an District, Zigong City, Sichuan Province He came from a peasant family in Taiwan and joined the Communist Party of China in 1939.

2. Married Peng Yongwu in 1945. After their marriage, he was responsible for the organization and distribution of the underground publication "Jinjin Daily" of the Chongqing Municipal Party Committee of the Communist Party of China.

3. In 1948, Peng Yongwu died in the war while serving as member of the East Sichuan Provisional Committee of the Communist Party of China and deputy secretary of the Lower Sichuan East Prefectural Committee, and Jiang Zhujun took over his job.

4. On June 14, 1948, Jiang Zhujun was arrested in Wanxian County and imprisoned in Chongqing Juntong Zhazidong Prison. Although he was tortured, he still refused to tell the truth.

5. He was killed by the enemy on November 14, 1949 and his body was destroyed.