Found a article on Ultimate Colossus
Codename: Colossus
Real name: Piotr (Peter) Nikolaievitch Rasputin
Group affiliation: The X-Men
Base of operations: Xavier Institute for Gifted Children
First appearance: Ultimate X-Men #1
Height: 6'6"
Weight: 250 lbs. normal, 500 lbs. in armoured form
Eye color: Blue
Hair color: Black
What the Professor says:
"Perhaps the development I'm most proud of is how Wolverine and Colossus have reinvented themselves over these last few months. Both young men raised in violence and misery, they now spend their evenings scanning newspapers for hard-luck stories and unsolved crimes... walking the streets from dusk 'til dawn in search of people who might be in need of their particular kind of help."
History:
A young Piotr Rasputin left his poverty-stricken family to make a living in the United States, where he joined the Russian Mafia. Peter kept his mutant power a secret, and became more and more sucesssful in the mafia world. However, every penny he earned was sent back to his family in Siberia.
During a illegal arms transaction on a dock in New York, Piotr and his associates were backstabbed and attacked with machine guns. Everyone on the dock was killed except for Piotr, who was saved by his mutant ability. Outted as a mutant, Piotr thought his life was over. But, he was found by Jean Grey and offered a place among the X-Men, a team of young mutants dedicated to bringing about peaceful coexistence between the two species of man. As Colossus, Piotr now serves as the squad's super-strong powerhouse!
After they were freed from the Weapon X project, Colossus and the X-Men embarked on a World Tour to promote Xavier's new book. While in London however, Colossus suddenly departed the team, and left home to Russia. With Cyclops and Marvel Girl on his trail, Piotr got a job with a car manufacturing plant, and proclaimed to Scott and Jean that he was indeed happy. Unsatisfied, the two persued Piotr until he explained his reason for leaving. Peter declared that he was unhappy with his place on the team, that he was ignored, and that none of his team members cared for him. Marvel Girl, however, disagreed, stating that his true reason was because of the feelings he had for a fellow team member. Peter promptly dismissed the two. Later that night, however, the local Russian news announced that a submarine had crashed underwater, and that there was no hope for the crews survival. Unable to sit idly by, Piotr took charge and dove to the submarine and dislodged it. When he reached the surface Colossus was doused with media attention, which proclaimed him the most famous super-hero on the planet. Peter put his grudges with the X-Men asside and left Russia with Cyclops and Marvel Girl to meet up with the X-Men in Germany, who were in a heated battle with Xavier's son David. With the professor torn between killing his son and allowing thousands of innocents to perish, Colossus took action, and crushed David with a car, ending the battle, as well as the lives of David and Col. Betsy Braddock.
Colossus and a handful of X-Men were invited to an evening out with the Hellfire Club, the X-Men's secret financers, at their headquarters in New York. There he met the Russian President, who had grown up merely a few miles from Piotr's collective in Russia. The group, including Jean, Ororo, and the Professor, were ambushed and captured. In truth, Hellfire had been monitoring Jean Grey, in order to user her as a vehicle to bring forth their ancient god, the Phoenix. The Phoenix arose in Jean, and she murdered the Hellfire Club. However, Xavier was able to force the Phoenix into submission, freeing Jean from it's grasp. Colossus was unharmed during the ordeal.
Colossus and the X-Men were forced out of the mansion with the U.S. Government on their backs. In the final climactic battle between the X-Men and The Ultimates, America's premier superhero team, Colossus stood his own against Iron Man and Thor, and was able to withstand a localized nuclear explosion direct at him by Hawkeye, proving Piotr's amazing strength.
After hiding out in a suburban New York home (unbeknownst to it's residents, thanks to Marvel Girl's abilities) Colossus and the X-Men located Magneto's flying citidal, using a signal sent by the captured Cyclops. Upon their arrival they were subdued by Magneto's control over the iron in their blood. Using his unimaginable power, Colossus was able to overcome Magneto's influence and broke free, attacking him mercilessly for the harm he had inflicted on Peter's friends, especially Wolverine. His concentration destroyed, Magneto released the X-Men who were able to apprehend him, all thanks to Piotr's determination.
Powers:
By no means is Ultimate Colossus the equivalent his 616 counterpart for he has shown to be far stronger, and possibly the strongest being in the Ultimate Universe. Piotr has the ability to transform his body from flesh and blood into organic steel, giving him superhuman strength and making him impervious to harm. Supposedly his power has not yet fully developed because of his youth. Some say that this armor in the Ultimate continuity is stronger than adamantium, but this has not been proven yet.
In this transformed state, Colossus' body gains around a inch in additional height and his body mass is doubled. The source of Colossus' gain in height and muscle mass is unknown, but possibly extradimensional.
Ultimate Colossus possesses vast superhuman strength, the limits of which have not been revealed. Ultimate Colossus strength was sufficient for him to battle powerhouses such as Ultimate Thor, Ultimate Ironman, and Ultimate Magneto placing his strength well into the Class 100 level, being able to lift in excess of 100 tons Making him one of the most if not the most powerful being in the Ultimate Universe.
Aside from his incredible strength, Ultimate Colossus steel skin possesses an amazing degree of invulnerability to injury, allowing him to battle with some of the strongest heroes of the Ultimate Universe. Ultimate Colossus armor is so great it can withstand a direct blast from a nuke, falls from great heights, exposure to temperatures less than -320o Fahrenheit to temperatures greater than that of the surface of the Sun, exposure to vaccum environments, direct contact with molting lava, etc without sustaining injury. Being conductive, he is immune to electricity. Colossus's armored body also cannot rust. A side effect of his armor's strength enhancing effect is a vastly greater muscle efficiency than an ordinary human. While armored, his muscles generate considerably less lactic acids than those of ordinary humans, granting him superhuman levels of stamina in all activities. He can exert himself at peak capacity for several days before fatigue begins to impair him. Colossus' armored form is also invulnerable to rusting under Earthly conditions. Colossus has demonstrated no need to breathe while he is in his armored state and there's no known limit as to how long he can remain in this form.
In the Ultimate continuity, it has been shown that Colossus's eyes do not turn into steel, but instead remain organic and vulnerable (in the normal continuity, Colossus's eyes have been able to withstand a gunshot). Also, unlike the "normal" Colossus, when he is knocked unconscious he remains in whatever form he was in (See the "Hellfire and Brimstone" plotline).