March Upcountry

"Right," the warrant officer agreed. "Which makes it some of the best possible taconite, so it's comparatively easy to work. But, even better, it's contaminated with vanadium, which is one of several possible hardening agents for steel. Molybdenum and chrome are a couple of others."

"Molybe—molby—?" Cord grimaced. "I can't pronounce that."

"Don't worry about it," Dobrescu said. "The point is, Targ, that it really is the local ore, and your know-how, that's special. And I ran a tap in on one of your main mines, and it's all laced with impurities: vanadium and molybdenum. In fact, I'd give odds that by the time you get back into full swing, you'll hit a vein that makes the best steel you've ever seen."

"Ah, good," Targ said. "We have long wondered what it was that made our water steel. That's part of it, surely."

"Hold on a minute," Roger said, frowning at Dobrescu. "Vanadium and molybdenum are important, yeah, but not really critical for sword steel, Doc." The warrant officer blinked at him in surprise, and the prince chuckled with a humor that was more than slightly sour. "I won't claim to be an expert on the topic," he said, "but no MacClintock can avoid learning at least a little about ancient weapons... no matter how hard he tries."

"Oh?" Dobrescu cocked an eyebrow, and Roger shrugged.

"Oh," he replied. "Vanadium helps produce a finer grain structure in heat-treated steel, which helps with the tempering process and eliminates some of the problems in overheating steel. And it helps prevent loss of temper in reheated metal, so steel with vanadium in it can withstand higher temperatures before losing its temper.

"Molybdenum does some of the same thing by helping to transmit the temperature deeper into the steel, and it also increases hardness some and helps reduce the fatigue factor. But carbon is the most critical element in hardening steel."

Both of Dobrescu's eyebrows had risen during the prince's explanation, and the warrant officer's surprise was not an isolated phenomenon. Even O'Casey was staring at her one-time student, and Roger shrugged.

"Hey, like I said, I'm a MacClintock," he told them.

"According to something I read years ago, though," Dobrescu said, "vanadium and molybdenum were what produced Damascene steel."

"Almost right," Roger told him. "The 'water pattern'—those white lines on the black background—are a crystalline damask that's largely the result of those sorts of impurities. But you can have that kind of pattern on a blade that really sucks. Good Damascene steel hits a carbon content of something like one and a half percent, if I remember correctly, but even then, the trick is in the tempering. There are some beautifully patterned blades in the Roger III Collection that were never properly heat treated. I think their Rockwell number was only thirty or so, which would make them pretty useless as real weapons. You need to hit a Rockwell of around fifty if you want something to cut through mail and bone like this baby." He touched the katana lying beside him even in T'Kal Vlan's tent

"Really?" O'Casey asked, trying to hide her delight at hearing Roger—her Roger!—in professorial mode. Sort of.

"Yeah. There were different techniques for making the good stuff back on Old Earth," Roger told her. "Europeans did it with pattern welding, the Japanese used mechanical construction, but the Indians probably did it closest to the way Voitan smiths did it, judging from this." He touched the katana again. "They heated the steel in sealed clay crucibles that allowed the iron to soak up lots of carbon."

"That is, indeed, how our craftsmen work," Targ said, regarding Roger narrowly. "It is part of our closely held craft secrets," he added, and Roger gri

"Don't worry, Targ—I don't plan on telling anyone else. But the humans who used that technique produced something called 'wootz' steel that happened to have the very impurities the Doc here was talking about thanks to the local ores. And he's probably right that their presence helps account for at least some of your weapons' superiority, but don't let that distract you. The real secret's in the tempering and how well you judge temperatures and what quenching techniques you use. You might not get as pronounced a 'water' pattern using steels without the impurities, but your people would still be turning out some of the best weapon-grade steel in the world!"

"But it is the water steel which warriors associate with the superiority of our blades," Targ pointed out. "It shows the soul of the steel."

"And it's flat out beautiful, too," Roger agreed. "I'm not saying the nature of your ore isn't important, just that you shouldn't sell yourselves or your smiths short. The hardest thing of all in making a true master blade is the tempering, and you guys obviously have that down. For the rest—" He shrugged. "Now that you've got access to the right ores again, everyone else will see that the true 'water steel' is back. I imagine that's going to do good things for your income while you rebuild the city."

"True," T'Kal Vlan put in. "It is what warriors and merchants will look for when they judge the quality of our blades, and it is well to know what creates it. But where else do we find these ingredients? If we do start to have problems, we could mine them separately and add them, no?"

"Yes," Roger said with a frown. "The problem is finding them and separating them. I'd say that for the time being, you should probably just use what you have. I'll talk to a couple of your ironmasters if you want. Between us, Dobrescu and I might be able to explain it and point them in the right direction. If I recall clearly, chrome is actually easier to detect and separate."

"It is if you have an acid," Dobrescu agreed. "Less so, otherwise. And it's tricky to hit the right proportions and heat treatments. Humans didn't turn out good chromium steel until, oh, the last century and a half or so before space flight, I think. Of course, they didn't have anyone from the outside telling them how it worked, either."

"No, but they had more or less started figuring out chemistry on their own by then," O'Casey pointed out, and frowned thoughtfully. "I wonder if we could help them make that jump," she mused, and Pahner snorted.

"It sounds to me like we could probably spend a year or three just trying to remember what we don't remember about the processes," the Marine observed. "It would be better to just come back with a lander filled with science texts."

"Agreed." Roger chuckled. "Or, hell, a lander filled with a social reconstruct team. I don't want to crack Mardukan society; I like most of what I see. But I do want to bring them into the Empire."

"We can do that," O'Casey said. "God knows we've brought in enough devolved human societies without smashing their forms."

"Like Armagh?" Roger asked with a grin.

"Well," the chief of staff said, "there's something to be said for a planet full of battling Irishmen. Look at the Sergeant Major."

"True, true," Pahner said. "However, to bring back a Soc team, we need to get to the port. And to get to the port..."

"We just have to put one foot in front of the other," Roger said. "And that means breaking up this little party."

"Yep." Pahner nodded. "Targ, Vlan, thank you for coming."

"Not a problem," Vlan said. "We're at your disposal until you leave."

"Thank you," Pahner said, carefully not raising an eyebrow at the surreptitious signal Dobrescu flashed him. "I think we'll see you tomorrow. Until then?"

"Yes," Targ said. "Thank you. And good night."

Pahner waited until the Mardukans had left the tent, then turned to the medic.

"Yes, Mister Dobrescu? You had something to add without the Mardukans present?"

The warrant officer glanced at the shaman behind Roger.

"Yes, Sir. But I'm not sure about Cord."