SNB16 Bolting Materials for High Temperature
STEELMAX Steel Story

 

SNB16 은 고온용 합금강 볼트재입니다.
SNB16 은 JIS G 4107, KS D 3755 에 나타나는

SNB5, SNB7, SNB16  3종류 Steel Grade가 있습니다.
이 규격에서의 볼트재란 봉강 및 나사 가공을 하지 않은 봉강,

스터드 볼트를 가리키며, 주로 고온에서 사용되는
압력 용기 밸브, 프랜지 및 이음 쇠에 사용되는

합금강 볼트재에 대한 규정입니다.
Chrome-Molybdenum-Vanadium Steel 합금강으로 불립니다.

SNB16 강재는 Killed steel로 제조 되며
열간 압연 (Hot Rolling) 또는 열간 단조 (Hot Forging)로 제조하고

필요에 따라 절삭 (Cutting), 연삭 (Grinding), 냉간 인발 (Cold Drawing) 등의
냉간 가공 (Cold Working)을 하며, 선재 (Wire Rods)를 제외한 볼트재는

Normalizing-Tempering 또는 Quenching-Tempering하며
Tempering의 온도는 650℃ 이상으로 규정 되 있습니다.

SBN16 은 ASTM
A193-B16 과 대응 가능합니다.

Killed Steel : Steel sufficiently deoxidized with ferrosilicon, aluminium, and so on.
In the case of ingot casting, during the progress of solidification in a ingot mold,

it is gently solidified without generation of carbon monoxide,
being comparatively uniform, with little segregation and has no blow hole. however,

because of a shrinkage cavity is formed in the centre of upper part, its yield is low,
In the case of continuous casting, it is killed steel and,comparing with an ingot casting,

uniformity and yield better. killed steel is further
classified according to grain size or deoxidizer.

Normalizing — Heat treatment consisting of austenitizing followed by air cooling.
The purposes of this operation are to eliminate the influence of pre-working,
to render the crystal grains finder and to improve their mechanical properties.

Quenching — Operation which consists of cooling a ferrous products more rapidly then in still air.
The use of a term specifying the cooling condition is recommended, for example
air- blast quenching, water  quenching, step quenching, etc.

Tempering — Heat treatment applied to a ferrous product, generally after quench hardening, or
another heat treatment  to bring the properties to the required level, and

consisting of heating to specific temperature (<Ac1 )and soaking one or more time,
following by cooling at an appropriate rate, Tempering generally leads to a

reduction in   hardness but can, in certain cases,
cause an increase in hardness(refer to secondary hardening.

A193 specification for alloy-steel and stainless steel bolting for high-temperature or
high pressure service and other special purpose applications.

 

Steel Grade SNB16 A193 B16
Chemical Composition
(%)
Carbon (C) 0.36~0.44 0.36~0.37
Silicon (Si) 0.20~0.35 0.15~0.35
Manganese (Mn) 0.45~0.70 0.45~0.70
Phosphorus (P) 0.040 max 0.035 max
Sulfur (S) 0.040 max 0.040 max
Chromium (Cr) 0.80~1.15 0.80~1.15
Molybdenum (Mo) 0.50~0.65 0.50~0.65
Vanadium (V) 0.25~0.35 0.25~0.35
Aluminum (Al) 0.015 max
Yield Strength
(N/㎟)
16≤D 725min 105 ksi
16<D≤100 655 min 95 ksi
100<D≤120 590 min 85 ksi
Tensile Strength
(N/㎟)
16≤D 860 man 125 ksi
16<D≤100 760 min 110 ksi
100<D≤120 690 min 100 ksi
 1 ksi = 6.9 Mpa (N/㎟)

 

Class Symbol Diameter Reference
Class1 SNB5 D100 max AISI501, ASTM A193 B5
Class2 SNB7 D120 max AISI4140, 4142, 4145, ASTM A193 B7
Class3 SNB16 D180 max ASTM A193 B16

 

DSC00670

SNB16 Bolting for High Temperature

 

machine

SNB16, Bolting for High Temperature, Cr-Mo-V

 

스틸맥스는 연구소 수준의
깊이 있는 철강에 대한 이해를 바탕으로,

Carbon Steel, Special Steel, Stainless, Functional steel,
Ni-Alloy, Cu-Alloy, Al-Alloy, Ti-Alloy, Forging .

Plate, Sections, H-BEAM, Angle, Channel,
Flat, Round Bar, Rail, Pipe & Tube, SMLS,

ASTM, ASME, AISI-AMS, ANSI, API, SAE, AS, CSA
DIN-EN , KS, JIS, DNV, ABS, GL, LR, KR, NK 의

국가규격, 국제단체 규격, 국제협회 규격부터
Mill Maker Standards까지 공급하고 있습니다.

Citius, Altius, Fortius,
더 빠르게, 더 높이, 더 강하게가 요구되는 올림픽처럼

공급이 어려운 철강재 공급에는
진정한 전문 선수를 필요로 합니다.

구매, 문의, 견적, 안내가 필요하신 경우
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