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Determination of corrosion resistance of stainless steels in chloride-containing media.

A steel is considered as resistant if PREN ≥ 32.

Determination of corrosion resistance of stainless steels in hydrosulphide media in the context of DIN EN ISO 15156 / NACE.

A steel is considered as resistant if PREN ≥ 40. PREN ≥ is sufficient for steels with Mo ≥ 1,5 wt.-%.

In schwefelwasserstoffhaltiger Atmosphäre (DIN EN ISO 15156 / NACE)

Chromium [wt.-%]

Molybdenum [wt.-%]

Tungsten [wt.-%]

Nitrogen [wt.-%]

PREN

CRC I (low)	CRC II (moderate)	CRC III (medium)	CRC IV (strong)	CRC V (very strong)
1.4003	1.4301	1.4401	1.4439	1.4565
1.4016	1.4307	1.4404	1.4462	1.4529
1.4512	1.4311	1.4435	1.4539	1.4547
	1.4541	1.4571		1.4410
	1.4318	1.4429		1.4501
	1.4306	1.4432		1.4507
	1.4567	1.4162
	1.4482	1.4662
		1.4362
		1.4062
		1.4578

Not resistant on delivery condition and sensitized condition	Resistant on delivery condition / Not resistant on sensitized condition	Resistant on delivery condition / resistant on sensitized condition
1.4310	1.4301	1.4307
1.4305	1.4303	1.4567
1.4570	1.4401	1.4311
1.4003	1.4436	1.4541
1.4000	1.4319	1.4306
1.4105	1.4325	1.4406
	1.4315	1.4404
	1.4597	1.4571
	1.4372	1.4432
	1.4374	1.4429
	1.4369	1.4435
	1.4020	1.4439
	1.4378	1.4539
	1.4016	1.4560
	1.4113	1.4550
	1.4523	1.4361
		1.4615
		1.4646
		1.4598
		1.4578
		1.4580
		1.4438
		1.4547
		1.4466
		1.4659
		1.4652
		1.4565
		1.4537
		1.4529
		1.4563
		1.4362
		1.4462
		1.4460
		1.4062
		1.4669
		1.4424
		1.4162
		1.4482
		1.4662
		1.4507
		1.4410
		1.4501
		1.4477
		1.4658
		1.4520
		1.4511
		1.4509
		1.4611
		1.4621
		1.4613
		1.4526